Ferroelectric energy storage

[Moreno]

Let say we have a ferroelectric capacitor which is capable to store 1 joule of energy. Then we remove charged plates and remain only fully polarized ferroelectric. Are there some ferroelectrics which are capable to retain its polarization for a long period of time? If yes, then are they capable to store energy just in polarization (without plates or free electrons)? Could there be some significant potential energy change when ferroelectric polarizes? If yes, how much? Will it release some energy (for example in the form of heat) when it depolarizes for some reason? If a capacitor with plates is capable to store 1 joule of energy then how much energy the same polarized ferroelectric would be able to store without plates? Is there some way to polarize a ferroelectric without free charge accumulation, but just by passing current next to it somehow?

[swansont]

1 hour ago, Moreno said:

Let say we have a ferroelectric capacitor which is capable to store 1 joule of energy. Then we remove charged plates and remain only fully polarized ferroelectric.

How much energy will removing the plates take?

 

 

[Moreno]

42 minutes ago, swansont said:

How much energy will removing the plates take?

 

 

Why is it important?

[swansont]

14 hours ago, Moreno said:

Why is it important?

To see if it's an efficient storage method.

[Moreno]

3 hours ago, swansont said:

To see if it's an efficient storage method.

Changes in electric polarization could be achieved with help of electromagnetic induction and magnetic fields it seems, we don't necessarily need a plates or free charge accumulation. Magnetic fields are formed around wires when current passes through. Possibly it may resemble magnetic polarization of a permanent magnet when current passes through. I guess we may store energy in a permanent magnet as well by polarizing it first and then retrieving energy back in form of electric current when magnet looses its magnetic polarization for some reason. For example demagnetizes spontaneously. But permanent magnets are not capable to store a lot of energy.

Quote

Various aspects of magnetic field control of magnetoelectric (ME) and electric properties of multiferroics are considered: linear ME effect appearance at magnetic field-induced incommensurate–commensurate phase transition, polarization switching and reversal by magnetic field and magnetic field-induced polarization flop transition.

https://www.sciencedirect.com/science/article/abs/pii/S030488530500939X

There is also such effect as dielectric adsorption in a dielectric capacitor.

Quote

Due to the hysteresis, at the zero point of the electric field, a material-dependent number of molecular dipoles are still polarized along the field direction without a measurable voltage appearing at the terminals of the capacitor. This is like an electrical version of magnetic remanence. The oriented dipoles will be discharged spontaneously over time and the voltage at the electrodes of the capacitor will decay exponentially.^[2] The complete discharge time of all dipoles can be days to weeks depending on the material.

https://en.wikipedia.org/wiki/Dielectric_absorption

Edited March 6, 2020 by Moreno

[swansont]

If you can't answer the question, just say so. An abstract that has no numbers isn't really helpful, and your second link doesn't seem to be relevant.

 

A dielectric feels a force pulling it in to a capacitor. you have to do work to remove it.