What is the difference between hcp and ccp structure ?
Asked by NAKSHATRA
| 4th Aug, 2014,
06:24: PM
Expert Answer:
- Placing the third layer over the second layer: There are two possibilities:
- Covering the tetrahedral voids: Here, tetrahedral voids of the second layer may be covered by the spheres of the third layer. It gives rise to ABABAB… type pattern. The three-dimensional structure is called hexagonal close-packed structure. Examples: Mg, Zn
- Covering the octahedral voids: Here, octahedral voids of the second layer may be covered by the spheres of the third layer. It gives rise to ABCABCABC… type pattern. The three-dimensional structure is called cubic close-packed structure or face-centred cubic structure. Examples: Cu, Ag
- Placing the third layer over the second layer: There are two possibilities:
- Covering the tetrahedral voids: Here, tetrahedral voids of the second layer may be covered by the spheres of the third layer. It gives rise to ABABAB… type pattern. The three-dimensional structure is called hexagonal close-packed structure. Examples: Mg, Zn
- Covering the octahedral voids: Here, octahedral voids of the second layer may be covered by the spheres of the third layer. It gives rise to ABCABCABC… type pattern. The three-dimensional structure is called cubic close-packed structure or face-centred cubic structure. Examples: Cu, Ag
Answered by Prachi Sawant
| 5th Aug, 2014,
11:13: AM
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