type of defects

The crystal AB (rock salt structure) has molecular weight 6.023Y u , where Y is an arbitrary number in u . If the minimum distance between cation and anion is Y^(1)/(3) nm and the observed density is 20 kg m^(-3) . Find a. The density in kg m^(-3) . and b. The type of defect

Name the type of defect that occurs in the crystals of zinc sulphide.

Identify the type of defect shows in the following figure : What type of substances show this defect ?

Which type of defect has the presence of cations in the interstitial sites ?

Which type of defect is product when NaCl is dopped with AlCl_(3) ?

Which type of 'defect' has the pressence of cations in the interstitial sites?