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Calcium crystallises in a face - centred...

Calcium crystallises in a face `-` centred cubic unit cell with `a=556nm`. Calculate the density if it contained `0.1%` Vaccancy defects.

Text Solution

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(i) Frenkel defect does not alter the density of solid.
`d=(MZ)/(a^(3)N)=(40xx4)/((0.556xx10^(-7))^(3)xx6.023xx10^(23)`
`=1.5455g//cm^(3)`
(ii) Shottky defect lowers the density of solid
`Z=4=(4xx0.1)/(100)=3.996`
`d=(40xx3.996)/((0.556xx10^(-7))^(3)xx6.023xx10^(23)`
`=1.5455g//cm^(3)`
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