Calcium copper titanate (CaCu3Ti4O12) is the material whose dielectric constant is among the highest, approximately 12,000 at room temperature, although this value varies widely as a function of particle size. It can be easily prepared by ceramic method, i.e. heating together the stoichiometric mixture of the single oxides it is made of, and sintering the result for making a pellet.

Alain 

Dear Lior Kornblum ·

Thanks for your valuable ans.

Last month I just started my research and i want to concentrate on this area so my guide ask me to concentrate on two points one is experimental result and another simulation result.

Although simulation is not a big deal but getting any high k material (like hafnium di oxide) is very tough .

So if i get material in bulk i can characterize it for nano scale devices

Lior Kornblum Sir 

Thank You So much sir for your guidance.

I think I will your suggestion on my research.

Thank you

Are you searching for a high enough dielectric constant in a given material which exhibits a stable dielectric constant at high temperatures. or

Are you looking for materials with a high dielectric breakdown strength.

A few questions:

What temperatures are you looking for.

What capacitance value are you looking for.

You must also specify the frequency range over which you want your dielectric constant to remain stable. and

if it is relating to breakdown, then are you considering dc/ac electric fields.

Once it becomes clear, than it becomes easy to suggest appropriate materials.

K. Sreenivas