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Types of Unit Cell

Packing fract...

Question

Packing fraction of $F C C$

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Solution

FCC Stands for Face Centred Cubic. It is a type of atomic arrangement and is relatively "tightly" packed (atomic packing factor $= 0.74$ ). FCC is formally defined as a cubic lattice with the face positions fully equivalent to each of the eight corners.

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Q. Assertion :Packing fraction of

F C C

H C P

unit cells are same. Reason: Both fcc and hcp unit cells have same packing pattern i.e.

A B C A B C A B C . . . . . . .

Q. The lattices of Na and Al are bcc and fcc respectively. Presuming them to be closed packed, their packing fractions are, respectively :

Statement: Packing fraction of FCC and HCP units cells are the same.

State whether the given statement is true or false.

Q. If a metal crystallises in fcc lattice then the packing fraction of its unit cell will be

यदि एक धातु fcc जालक में क्रिस्टलीकृत होती है, तो इसकी एकक कोष्ठिका का संकुलन प्रभाज होगा

The correct order of the packing efficiency in different types of nuit cells is ............

(a) fcc < bcc < simple cubic (b) fcc > bcc > simple cubic

(c) fcc < bcc > simple cubic (d) fcc < bcc > simple cubic

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