# Electrocaloric effect

### From Online Dictionary of Crystallography

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== Definition == | == Definition == | ||

- | The electrocaloric effect is the converse of the pyroelectric effect: it describes the variation of entropy δσ of a material submitted to an electrical field ''E<sub>i</sub> '': | + | The electrocaloric effect is the converse of the pyroelectric effect: it describes the variation of entropy δσ of a material submitted to an applied electrical field ''E<sub>i</sub> '': |

<center> | <center> | ||

''δσ'' = ''p<sub>i</sub><sup>T</sup>'' ''E<sub>i</sub> '' | ''δσ'' = ''p<sub>i</sub><sup>T</sup>'' ''E<sub>i</sub> '' |

## Revision as of 09:34, 12 January 2007

Effet électrocalorifique (*Fr*).

## Definition

The electrocaloric effect is the converse of the pyroelectric effect: it describes the variation of entropy δσ of a material submitted to an applied electrical field *E _{i} *:

*δσ* = *p _{i}^{T}*

*E*

_{i}where *p _{i}^{T}* is the electrocaloric coefficient at constant stress. It is equal to the pyroelectric coefficient.

## See pyroelectricity

## See also

An introduction to crystal physics (Teaching Pamphlet of the *International Union of Crystallography*)

Section 10.2 of *International Tables of Crystallography, Volume A*

Section 1.1.4 and part 3 of *International Tables of Crystallography, Volume D*