What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (2023)

What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (1)

We’ve already covered the difference between the common cubic crystals (FCC and BCC), so now it’s time to discuss the difference between the common close-packed crystals (FCC and HCP).

You might think a face-centered cubic (FCC) crystal wouldn’t have much in common with a hexagonal close-packed (HCP) crystal, but by certain definitions, they are actually the same thing!

FCC and HCP are both close-packed with a 74% atomic packing factor, 12 nearest neighbors, and the same interstitial sites. However, HCP only has 3 slip systems, while FCC has 12 slip systems, which lead to very different mechanical properties.

The most direct difference between FCC and HCP crystals is in the atomic arrangements. The face-centered cubic structure is a cube with an atom at all 8 corner positions, and at the center of all 6 faces. The hexagonal close-packed structure is a hexagon with an atom at all 12 corner positions, an atom on the top and bottom face, and 3 atoms in the center.

What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (2)

FCC and HCP also have many different measurements within the unit cell, as shown in the table below.

Crystal StructureFCCHCP
Unit Cell TypeCubicHexagonal
Relationship Between
Cube Edge Length a and
the Atomic Radius R
a = 2R√2a = 2R
Close-Packed StructureYesYes
Atomic Packing Factor
(APF)
74%74%
Coordination Number1212
Number of Atoms per Unit Cell46
Number of Octahedral
Interstitial Sites
46
Number of Tetrahedral
Interstitial Sites
812

Outline

  • What is the Packing Difference and Stacking Faults Between FCC and HCP?
  • Slip Systems in FCC and HCP
  • Interstitial Sites in FCC and HCP
  • Examples of FCC and HCP Elements
  • Final Thoughts
  • References and Further Reading

What is the Packing Difference and Stacking Faults Between FCC and HCP?

Both FCC and HCP are close-packed, which means they have the maximum theoretical packing density of about 74%. You can check this article for details about this calculation for atomic packing factor.

The difference between FCC and HCP lies in the close-packed stacking order.

(Video) Unit Cell Chemistry Simple Cubic, Body Centered Cubic, Face Centered Cubic Crystal Lattice Structu

Consider the close-packed plane, which has a hexagonal 2D arrangement. Now, if you add a layer on top of it, the atoms in this layer will have to fit between the gaps in the first layer. As you can see, there are 2 possibilities.

What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (3)

In total, there are 3 ways to orient each close-packed layer–we name these arrangements by the letters A, B, and C.

If you modeled atoms as simple spheres, there would only be one rule for stacking: the same letter can’t repeat. Otherwise, the order could be random, with no repeating pattern. If this were the case, then there would be no difference between FCC and HCP.

However, due to interatomic forces, the layer orders are not random, and they do repeat. If the layers repeat AB-AB-AB… then the crystal is HCP. If the layers repeat ABC-ABC-ABC…then the crystal is FCC.

What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (4)

Of course it’s possible for the crystal to have a defect, such as putting a C layer where there is supposed to be a B layer. This kind of defect is called a stacking fault.

If you want to read more about stacking faults and other close-packed structures (such as 9R), you may be interested in my in-depth article about close-packed crystals.

Slip Systems in FCC and HCP

FCC metals tend to be more ductile than HCP metals because of their different slip systems.

The basic requirement for ductility is to have 5 independent slip systems. (I’d recommend reading “Kelly & Knowles, Crystallography and Crystal Defects” if you want to prove this). If you don’t understand Miller Indices, this next section will be hard to follow. When reading indices for hexagonal crystals, I’ll use the Miller-Bravais system.

(Video) Lecture - Intro to Crystallography

FCC crystals are close-packed along the What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (5) planes, and the What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (6) direction within that plane. Since atoms are closely packed along these directions, these are the slip planes and slip directions. Overall, we call the slip system What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (7). Atoms are much more likely to slip in these directions because they are closer-packed.

There are 4 different planes in the What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (8) family, and 3 different directions in the What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (9) family, for a total of 12 independent slip systems. This is more than the requisite 5, so FCC crystals are ductile.

HCP crystals have only 1 close packed plane: the What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (10) plane. There are 3 close packed directions in the What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (11) family. Thus, HCP structures only have 3 independent slip systems, which is less than the 5 required for ductility.

What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (12)

However, it is possible for HCP crystals to activate additional slip systems such as along What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (13) in some metals.

Name of a
Slip System
Number of
Slip Systems
Slip PlaneSlip Direction
Basal3What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (14) What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (15)
Prismatic3What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (16)What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (17)
Pyramidal12What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (18)What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (19)

These may be thermally activated and thus give some HCP metals a ductile-to-brittle transformation temperature (DBTT), which has been studied in Zn and Mg alloys. HCP metals usually do not display a DBTT.

One additional method which allows HCP metals to have ductility (despite having fewer than 5 slip systems) is by twinning.

What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (20)

Twinning is fundamentally different from slip and is more common in HCP crystals than FCC crystals. Even when twinning is possible in FCC metals, slip is usually “easier” to accommodate any deformation, so that’s the path atoms take.

In FCC metals twinning is linked to having a “low stacking fault energy (SFE).” A low SFE means that stacking faults are more common–in other words, the crystal structure is somewhere between FCC and HCP.

(Video) GET 272 Lecture 5

Interstitial Sites in FCC and HCP

Because FCC and HCP are both composed of close-packed layers, they have the same type and number of interstitial sites–the only difference is the location of these interstitial sites.

You already know that unit cells of metals are not fully packed (74% for FCC and HCP), which means they have some empty space.

Smaller atoms can fit in these spaces. Because of the different interstitial sites, different atoms can form different interstitial alloys depending on the crystal structure.

As a rule of thumb, atoms that fit in interstitial sites should be less than 15% of the size of atoms in regular sites. In fact, the exact radius ratio also determines which kind of interstitial site can be occupied.

The two main types of interstitial sites are octahedral and tetrahedral.

What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (21)

These sites are named because of their nearest neighbors. Octahedral sites have 6 nearest neighbors, and tetrahedral sites have 4 nearest neighbors.

You can read all about interstitial sites in this article, but here’s a summary of the interstitial sites regarding FCC and HCP crystals. If you want to prove these numbers, check out that article.

Crystal StructureFCCHCP
Number and Size of
Octahedral Voids
4 voids, r = 0.414 R6 voids, r = 0. 414 R
Number and Size of
Tetrahedral Voids
8 voids, r = 0.225 R12 voids, r = 0.225 R

Examples of FCC and HCP Elements

At room temperature, some common FCC metals are aluminum, nickel, and copper. Some common HCP metals are cobalt, magnesium, and titanium.

(Video) Crystal Structure Day 1 - Properties of Materials

Here is a list of all the elements which are FCC, BCC, or HCP at room temperature.

Face-Centered Cubic (FCC) elements:
  • Aluminum (Al)
  • Calcium (Ca)
  • Copper (Cu)
  • Gold (Au)
  • Iridium (Ir)
  • Lead (Pb)
  • Nickel (Ni)
  • Palladium (Pd)
  • Platinium (Pt)
  • Rhodium (Rh)
  • Silver (Ag)
  • Strontium (Sr)
  • Thorium (Th)
  • Ytterbium (Yb)
  • Body-Centered Cubic (BCC) elements:
  • Barium (Ba)
  • Cesium (Cs)
  • Chromium (Cr)
  • Europium (Eu)
  • Iron (Fe)
  • Lithium (Li)
  • Manganese (Mn)
  • Molybdenum (Mo)
  • Niobium (Nb)
  • Potassium (K)
  • Radium (Ra)
  • Rubidium (Rb)
  • Sodium (Na)
  • Tantalum (Ta)
  • Tungsten (W)
  • Vanadium (V)
  • Hexagonal Close-Packed (HCP) elements:
  • Beryllium (Be)
  • Cadmium (Cd)
  • Cobalt (Co)
  • Dysprosium (Dy)
  • Erbium (Er)
  • Gadolinium (Gd)
  • Hafnium (Hf)
  • Holmium (Ho)
  • Lutetium (Lu)
  • Magnesium (Mg)
  • Osmium (Os)
  • Rhenium (Re)
  • Ruthenium (Ru)
  • Scandium (Sc)
  • Technetium (Tc)
  • Terbium (Tb)
  • Thallium (Tl)
  • Thulium (Tm)
  • Titanium (Ti)
  • Yttrium (Y)
  • Zinc (Zn)
  • Zirconium (Zr)

  • In general, alloys with these metals will have the same crystal structure as the most common element. However, there are always exceptions. (For example, cobalt and iron can both be FCC when heavily alloyed, especially with nickel).

    What is the Difference Between FCC and HCP? (Crystal Structure, Properties, Interstitial Sites, and Examples) | Materials Science & Engineering Student (22)

    Final Thoughts

    Now you know all the differences between FCC and HCP! You also know many common materials that take each form. Now you see, even though FCC and HCP are both close-packed, the symmetry difference between them leads to different mechanical properties.

    References and Further Reading

    If you’re reading this article as an introductory student in materials science, welcome! I hope you can find many other useful articles on this website.

    If you’re reading this article because you’re taking a class on structures, you may be interested in my other crystallography articles. Here is this list, in recommended reading order:

    Introduction to Bravais Lattices
    What is the Difference Between “Crystal Structure” and “Bravais Lattice”
    Atomic Packing Factor
    How to Read Miller Indices
    How to Read Hexagonal Miller-Bravais Indices
    Close-Packed Crystals and Stacking Order
    Interstitial Sites
    Primitive Cells
    How to Read Crystallography Notation
    What are Point Groups
    List of Point Groups
    What are Space Groups
    List of Space Groups
    The 7 Crystal Systems

    If you are interested in more details about any specific crystal structure, I have written individual articles about simple crystal structures which correspond to each of the 14 Bravais lattices:

    1. Simple Cubic
    2. Face-Centered Cubic
    2a. Diamond Cubic
    3. Body-Centered Cubic
    4. Simple Hexagonal
    4a. Hexagonal Close-Packed
    4b. Double Hexagonal Close-Packed (La-type)
    5. Rhombohedral
    5a. Rhombohedral Close-Packed (Sm-type)
    6. Simple Tetragonal
    7. Body-Centered Tetragonal
    7a. Diamond Tetragonal (White Tin)
    8. Simple Orthorhombic
    9. Base-Centered Orthorhombic
    10. Face-Centered Orthorhombic
    11. Body-Centered Orthorhombic
    12. Simple Monoclinic
    13. Base-Centered Monoclinic
    14. Triclinic

    (Video) Metal crystal structures

    FAQs

    What is the difference between fcc and hcp crystals? ›

    The key difference between FCC and HCP is that FCC structure cycles among three layers whereas HCP structure cycles among two layers. FCC is a face-centred cubic close-packed structure while HCP is a hexagonal close-packed structure.

    What are the similarities and differences between fcc and hcp structures? ›

    FCC and HCP are both close-packed with a 74% atomic packing factor, 12 nearest neighbors, and the same interstitial sites. However, HCP only has 3 slip systems, while FCC has 12 slip systems, which lead to very different mechanical properties.

    What are the differences between fcc and bcc crystals? ›

    The BCC unit cell consists of a net total of two atoms, the one in the center and eight eighths from the corners. In the FCC arrangement, again there are eight atoms at corners of the unit cell and one atom centered in each of the faces. The atom in the face is shared with the adjacent cell.

    What do fcc and hcp have in common? ›

    Dear Sohail, FCC or the Face centres cubic and Hexagonal close packed structures both have a packing factor of 0.74, consists of closely packed planes of atoms and have a coordination number of 12. That is where the similarities end.

    What is fcc and hcp structure? ›

    The hexagonal closest packed (hcp) has a coordination number of 12 and contains 6 atoms per unit cell. The face-centered cubic (fcc) has a coordination number of 12 and contains 4 atoms per unit cell.

    What is the fcc crystal structure? ›

    FCC (face centered cubic): Atoms are arranged at the corners and center of each cube face of the cell. Atoms are assumed to touch along face diagonals. 4 atoms in one unit cell. Atoms are arranged at the corners of the cube with another atom at the cube center.

    Why FCC and hcp structures have the same packing factor? ›

    Both in hcp and fcc, the layers are formed of same atoms in similar arrangements but the only difference is the placement of layers on top of each other. Hence, both have same packing fraction. In both the arrangements, the number of atom of same size present around the atom is maximum, i.e. 6.

    What is an hcp crystal structure? ›

    The Hexagonal Close-Packed (HCP) crystal structure is one of the most common ways for atoms to arrange themselves in metals. The HCP crystal structure is based on the Bravais lattice of the same name, with 1 atom per lattice point at each corner of the hexagonal prism, and 3 inside the prism.

    What is the difference between hcp and CCP? ›

    The hcp and ccp structure cannot have the same density even if they both are made up of the same element because both these structures have different numbers of atoms per unit cell. The hcp structure has 8 spheres per unit cell whereas the ccp structure has 4 spheres per unit cell.

    What is FCC stand for in engineering? ›

    BCC – Body Centred Cubic – and FCC – Face Centred Cubic – are descriptions of the arrangement of atoms in crystal structures. Most metal and alloys are crystalline, which means that their atoms arrange themselves in an ordered pattern.

    What is FCC in material science? ›

    arrangement of atoms

    , which is called the face-centred cubic (fcc), or cubic-closest-packed, lattice. Copper, silver (Ag), and gold (Au) crystallize in fcc lattices. In the hcp and the fcc structures the spheres fill 74 percent of the volume, which represents the closest possible packing of spheres.

    What is the difference between FCC and CCP? ›

    The cubic closed packing is CCP, FCC is cubic structures entered for face. When we put the atoms in the octahedral void, the packing is of the form of ABCABC, so it is known as CCP, while the unit cell is FCC. The unit cell consists of four layers of atoms in a cubic close-packed (ccp) arrangement of atoms.

    Why is HCP stronger than FCC? ›

    Briefly explain your answer. The HCP crystal structure has a lower degree of symmetry than cubic crystal structures; this lower symmetry provides fewer active slip systems and, in general, lower ductility in HCP structures.

    Is FCC or HCP more stable? ›

    We find that the HCP polymorph remains at least as stable as its FCC counterpart across the entire range of interactions we explored, where interactions were quantified by the reduced second virial coefficient, −1.50 < B*2 < 1.01.

    What is the stacking sequence of FCC & of HCP? ›

    The first two layers are identical for hcp and fcc, and labelled AB. If the third layer is placed so that its atoms are directly above those of the first layer, the stacking will be ABA — this is the hcp structure, and it continues ABABABAB.

    What is hcp in chemistry class 12? ›

    Hexagonal close packing (hcp):

    In this arrangement, the spheres are closely packed in successive layers in the ABABAB type of arrangement. Each unit cell has 17 spheres with radius “r” and edge length of unit cell “2r.”

    What is crystal structure explain with examples? ›

    A crystal structure is made of atoms. A crystal lattice is made of points. A crystal system is a set of axes. In other words, the structure is an ordered array of atoms, ions or molecules. Crystal Structure is obtained by attaching atoms, groups of atoms or molecules.

    What is fcc formula? ›

    The relation between edge length (a) and radius of atom (r) for FCC lattice is √(2a) = 4r .

    How do you draw an fcc crystal structure? ›

    FCC crystal structure - YouTube

    Which has more packing efficiency hcp or fcc? ›

    The packing efficiency in fcc and hcp structures is 74% . The packing efficiency of a body-centred unit cell is 68% . Packing efficiency of a simple unit cell is 52.4% .

    Which is the example of hcp? ›

    The hcp structure is very common for elemental metals and some examples include beryllium, cadmium, magnesium, titanium, zinc and zirconium.

    What is hcp also called? ›

    arrangement of atoms

    In crystal: Structures of metals. , which is called the hexagonal- closest-packed (hcp) structure.

    What is hcp stands for? ›

    A type of advance directive that gives a person (such as a relative, lawyer, or friend) the authority to make healthcare decisions for another person. It becomes active when that person loses the ability to make decisions for himself or herself. Also called health care proxy.

    What is hcp in material? ›

    Hexagonal close-packed (HCP) metals and alloys, which include titanium, zirconium, magnesium, etc., are extensively used in a variety of industrial sectors.

    What is the purpose of the FCC? ›

    The Federal Communications Commission regulates interstate and international communications through cable, radio, television, satellite and wire. The goal of the Commission is to promote connectivity and ensure a robust and competitive market.

    What is FCC ID used for? ›

    FCC IDs are usually shown on a label found on a certified radio frequency device and indicates that the device has received a FCC grant of certification.

    What does FFC stand for in construction? ›

    FFC - Flat Flexible Cables.

    What properties do FCC metals have? ›

    For example, FCC metals, Cu, Au, Ag, are usually soft and 'ductile', which means they can be bent and shaped easily. BCC metals are less ductile but stronger, eg iron, while HCP metals are usually brittle. Zinc is HCP and is difficult to bend without breaking, unlike copper.

    What is the unit of FCC? ›

    Face-centred Cubic Unit Cell (FCC)

    An FCC unit cell contains atoms at all the corners of the crystal lattice and at the centre of all the faces of the cube. The atom present at the face-centered is shared between 2 adjacent unit cells and only 1/2 of each atom belongs to an individual cell.

    What is FCC in phase diagram? ›

    This phase is an interstitial solid solution of carbon in γ-iron (fcc).
    ...
    Explanation of iron-carbon phase diagram.
    HDelta (δ) phase (bcc) containing 0.09% carbon.
    JGamma (γ) phase (fcc) containing 0.17% carbon (Peritectic composition).
    3 more rows

    What is the difference between crystal lattice and unit cell? ›

    Difference between unit cell and crystal lattice

    The crystal lattice is the geometric orientation of the constituent particles (atoms, molecules, or ions) in a three-dimensional space. a unit cell has a fixed volume and a specific number of lattice points.

    What is coordination number of hcp? ›

    The hexagonal closest packed (hcp) contains 6 atoms and also has a coordination number = 12.

    Is hcp and BCC same? ›

    In BCC, particles are present at corners and one particle is present at the centre within the body of the unit cell. In HCP, the packing gives a hexagonal pattern.

    Why FCC metals are in general more ductile than bcc and HCP? ›

    Even though both FCC and BCC have equal number of slip systems present in the structure, FCC is more ductile. Because the slip planes in the FCC structure are of the closest packing. This is not true for BCC. This means that, the %empty space in a plane is higher in BCC.

    Is FCC or HCP more ductile? ›

    The fcc lattice is both cubic and closely packed and forms more ductile materials. Gamma-iron, silver, gold, and lead have fcc structures. Finally, HCP lattices are closely packed, but not cubic. HCP metals like cobalt and zinc are not as ductile as the fcc metals.

    Why FCC metals are more ductile as compared to bcc and HCP metals? ›

    A face-centered cubic (FCC) crystalline structure exhibits more ductility than a body-centered cubic structure (BCC) because the BCC lattice is not closely packed although it is cubic.

    What is the difference between CCP and HCP? ›

    The hcp and ccp structure cannot have the same density even if they both are made up of the same element because both these structures have different numbers of atoms per unit cell. The hcp structure has 8 spheres per unit cell whereas the ccp structure has 4 spheres per unit cell.

    Why is HCP stronger than fcc? ›

    Briefly explain your answer. The HCP crystal structure has a lower degree of symmetry than cubic crystal structures; this lower symmetry provides fewer active slip systems and, in general, lower ductility in HCP structures.

    What is the difference between fcc and CCP? ›

    The cubic closed packing is CCP, FCC is cubic structures entered for face. When we put the atoms in the octahedral void, the packing is of the form of ABCABC, so it is known as CCP, while the unit cell is FCC. The unit cell consists of four layers of atoms in a cubic close-packed (ccp) arrangement of atoms.

    What is the difference between HCP and bcc? ›

    BCC metals are less ductile but stronger, eg iron, while HCP metals are usually brittle. Zinc is HCP and is difficult to bend without breaking, unlike copper. Many other features depend upon the crystal structure of metals, such as density, deformation processes, alloying behavior, and much more.

    What is hcp in engineering? ›

    Hexagonal close packed (hcp) refers to layers of spheres packed so that spheres in alternating layers overlie one another. Hexagonal close packed is a slip system, which is close-packed structure. The hcp structure is very common for elemental metals, including: Beryllium.

    What is a hcp structure? ›

    Hexagonal tightly packed (hcp) refers to layers of packed spheres such that spheres overlay each other in alternating layers. A slip framework, which is a close-packed structure, is hexagonal near packed. For elemental metals, the hcp structure is very general, including beryllium.

    What is hcp crystal system? ›

    The Hexagonal Close-Packed (HCP) crystal structure is one of the most common ways for atoms to arrange themselves in metals. The HCP crystal structure is based on the Bravais lattice of the same name, with 1 atom per lattice point at each corner of the hexagonal prism, and 3 inside the prism.

    Why FCC and hcp structures have the same packing factor? ›

    Both in hcp and fcc, the layers are formed of same atoms in similar arrangements but the only difference is the placement of layers on top of each other. Hence, both have same packing fraction. In both the arrangements, the number of atom of same size present around the atom is maximum, i.e. 6.

    Is FCC or HCP more stable? ›

    We find that the HCP polymorph remains at least as stable as its FCC counterpart across the entire range of interactions we explored, where interactions were quantified by the reduced second virial coefficient, −1.50 < B*2 < 1.01.

    What is bcc FCC and hcp? ›

    However most metals and many other solids have unit cell structures described as body center cubic (bcc), face centered cubic (fcc) or Hexagonal Close Packed (hcp). Since these structures are most common, they will be discussed in more detail.

    What is hcp in chemistry class 12? ›

    Hexagonal close packing (hcp):

    In this arrangement, the spheres are closely packed in successive layers in the ABABAB type of arrangement. Each unit cell has 17 spheres with radius “r” and edge length of unit cell “2r.”

    What is the difference between crystal lattice and unit cell? ›

    Difference between unit cell and crystal lattice

    The crystal lattice is the geometric orientation of the constituent particles (atoms, molecules, or ions) in a three-dimensional space. a unit cell has a fixed volume and a specific number of lattice points.

    What is the full form of hcp in chemistry? ›

    Hexagonal Close Packed (hcp) (ABAB…layer sequence) (e.g. Zn) Unit cell of Zn Full 3D structure of Zn. HCP can be represented as a layer structure. Other Hexagonal Close Packed structures include Mg, Ti, Co, Cd and Be. Cubic Closed Packed (ccp) Sometimes called face centred cubic (fcc) (ABCABC…layer sequence)

    What is an hcp site? ›

    A HCP website provides content and online tools for HCPs specifically, and access is restricted from the general public. Pharmaceutical or other medical resources providers have developed most of the HCP websites. Some are branded sites, and others are non-branded and more generic and medical in context.

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