Solid State Question 38
Question: A mineral having the formula $ AB_2 $ crystallizes in ccp lattice with A atoms occupying the lattice points. Pick out the correct statement of the following
Options:
A) 100% occupancy of tetrahedral voids, C.N. of $ B=4 $
B) 100% occupancy of octahedral voids, C.N. of B=4
C) 50% occupancy of tetrahedral voids, C.N. of A=4
D) 100% occupancy of octahedral voids, C.N. of A =4
Show Answer
Answer:
Correct Answer: A
Solution:
[a] Number of A cations per unit cell = 4
Number of B anions per unit cell must be $ =2\times 4=8 $
Number of tetrahedral voids per unit cell $ =2\times 4=8 $
Number of octahedral voids per unit all $ =1\times 4=4. $
Hence, occupancy of tetraral voids =100%
BETA
