What are metal excess defects in crystals ? How are these caused ?

Metal excess defect arises due to

What are metallic crystals ?

What are point defects in crystals ? Describe the Schottky defects in crystals.

What are non-stoichiometry defects in crystals ? Explain.

How Schottky and Frenkel defects occur in ionic crystals? How does the density of a crystal gets affected by the presence of these defects ?

Schottky defect in a crystal is observed when

Assertion: p-type semiconductors are good conductors of electricity due to metal excees defects Reason: f-centres are created due to metal excess defects

Define Frenkel defect in solid crystal.

Statement-1:p-type semiconductor are good conductor of electricity due to metal excess defect. Statement-2: F-centres are created due to metal excess defect.