Question

Magnetite, a magnetic oxide of iron used on recording tapes, crystallises with iron atoms occupyin 1/8 of the tetrahedral holes and 1/2 of the octahedral holes in a closed packed array of oxides ions. What is the formula of magnetite?

Answer 1

$\nearrow (4{)}_{\searrow Oh\Rightarrow Fe1/2\times 4=2}^{\nearrow Fe\Rightarrow 1/8\times 8=1}$

ccp lettice $\frac{1}{2}\times 4=2$ ${}^{\circ }n\text{voids}=4$

Td " = 8

Total Fe = 3

Formula = $\text{F}{\text{e}}_{\text{3}}{\text{O}}_{\text{4}}$