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Shifana posted an Question

July 26, 2020 • 02:31 am

30 points

IIT JAM
Chemistry (CY)

Is bcc same as abab arrangment ?

is bcc same as abab?..............................................................

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Priyanshu kumar

CCP stands for cubic closed packing , FCC is for face centered cubic structure… Now , HCP and CCP are one of the forms in which a cubic lattice is arranged and FCC is one of the types of unit cells(in general). When we place the atoms in the octahedral voids the packing is of ABCABC.. type.This is known as CCP. Now sometimes we also call it as face centered closed structure (FCC)But remember FCC can also stand for the unit cell (Face centered cell). *Hexagonal close packed (hcp). 12:12 coordination. ABAB layers. Cubic close packed(ccp). 12:12 coordination. ABCABC layers. Body centred cubic (bcc) 8:8 coordination. Face centred cubic (fcc) is just an alternate name for ccp.
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Mainly for whole cubic lattice we use CCP and HCP
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Dinesh khalmaniya 1

check this for more details
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check it for your doubt
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the % of occupation is given wrong in the guide. ryt?
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yes, there is mistake in this notes
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Dinesh khalmaniya 1

hope this will help you 🙏🙏
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why hcp is considerd under unit cell? i mean basicaly we tell fcc, bcc, primitive,ecc.
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because HCP is smallest unit which on repeating gives whole lattice
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Dinesh khalmaniya 1

yes, check it
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