Bigger ions form the close packed structure.

Smaller ions occupy either the tetrahedral or the octahedral voids depending upon their size.

Occupation of all the voids is not necessary.

The fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions occupying the voids.

all the domains get oriented in the direction of magnetic field.

all the domains get oriented in the direction opposite to the direction of magnetic field.

domains get oriented randomly.

domains are not affected by magnetic field.

fcc < bcc < simple cubic

fcc > bcc > simple cubic

fcc < bcc > simple cubic

bcc < fcc > simple cubic

Frenkel defect

Schottky defect

Non-stoichiometric defect

Simple interstitial defect