What is the effect of Frenkel defect on the electrical conductivity of crystalline solids ?

What is the effect of Frenkel defect on electrical conductivity of solid?

What is the effect of Frenkel stuctural defect on the electrical conductivity of a crystalline solid?

What are the consequences of Frenkel defects ?

What is Frenkel Defect?

Density of ionic substance is unchanged in Frenkel defect, but the conductivity of ionic crystalline solid increases. Comment.