First slide

Crystal lattices and unit cells

Question

Which of the following compounds represent a normal 2:3 spinel structure ?

Moderate

A

$M g^{11} A {l_{2}}^{111} O_{4}$
B

$C o^{11} {(C o^{111})}_{2} O_{4}$
C

$Z n (T i Z n) O_{4}$
D

$N i {(C O)}_{4}$

Solution

dipositive occupy one by eight of tetrahedral site and two tripositive cations occupy half of octahedral sites and oxide ions occupy fcc

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