Dear Subhasri,

I think you are interested in dielectric breakdown as you work on supercapacitor.

It's really interesting and and important field of theoretical as well application point of view.

I was searching for Materials with high breakdown voltage as well as high dielectric constant.

I want to prepare a supercapacitor of 1 Farad Capacitance that can withstand 100 Volt or more.

Generally available supercapacitors are of 4.7 V or 12 volt or something like that.

If the voltage can be increased keeping the capacitance 1F and side not so large, then that will be a very important work.

I can't do it. I don't find such Capacitor in market.

Best Wishes

N Das

Dr Sabudhi:

Only in the ferroelectric phase and it is induced by polarization ... Electron emission from conventional cathodes occurs due to ... In the present review we also discuss a third stage of ... verifying the model: free electrons which are in the region of ... The driving voltage and current through the sample were. For a closer look please refer to:

Article Electron Emission from Ferroelectrics

Dear Subhasri,

Though the question is not clear to me, I am commenting something on the basis of what I think.

In Ferroelectric phase , analogous to Ferromagnetic case, the atomic Electric dipoles are oriented along the direction of applied external electric field.

If the material under consideration is such the atoms or molecules are non polar, even then the applied electric field polarises the atoms or molecules and produce a bulk polarisation .

This reduces the electric field inside the material .

If the material is a high conducting material, then the free electrons move opposite to the direction of applied field producing a current. But, due to polarisation, the field inside the material is reduced which affects the flow of free electrons and changes the current. Basically this is nothing but a change in resistivity of the material.

One more important phenomenon is

Hall co- coefficient. The application of external field changes the Hall coefficient of the material.

If you increase the applied electric field upto a limit , the atomic or the molecular dipoles breaks down and produces high current. This burns out the material . This effect is called dielectric breakdown.

You can work on dielectric breakdown and the related interesting phenomena.

Please specify the Question otherwise my discussion will not be to the point of your interest.

Best Wishes

N Das

Dear Subhasri,

I think you are interested in dielectric breakdown as you work on supercapacitor.

It's really interesting and and important field of theoretical as well application point of view.

I was searching for Materials with high breakdown voltage as well as high dielectric constant.

I want to prepare a supercapacitor of 1 Farad Capacitance that can withstand 100 Volt or more.

Generally available supercapacitors are of 4.7 V or 12 volt or something like that.

If the voltage can be increased keeping the capacitance 1F and side not so large, then that will be a very important work.

I can't do it. I don't find such Capacitor in market.

Best Wishes

N Das