What is the difference between linear and non-linear dielectrics?

[lavster]

can someone please tell me what a linear dielectric is, in words?

thanks

 

[Meir Achuz]

One in which D is proportional to E.

 

[Gordianus]

In a linear dielectric the electric dipolar moment per unit volume (modulus of vector P) has a linear dependence on the electric field E

 

[lavster]

thanks for that! could you give me an example of a dielectric which is linear, and one which is not please?

 

[Gordianus]

Glass is mostly linear whilst barium titanate is highly non-linear