# Difference between revisions of "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 | + | 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> '': |

<center> | <center> | ||

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

</center> | </center> | ||

where ''p<sub>i</sub><sup>T</sup>'' is the electrocaloric coefficient at constant stress. It is equal to the pyroelectric coefficient. | where ''p<sub>i</sub><sup>T</sup>'' is the electrocaloric coefficient at constant stress. It is equal to the pyroelectric coefficient. | ||

+ | |||

+ | == See also == | ||

+ | |||

+ | [http://www.iucr.org/iucr-top/comm/cteach/pamphlets/18/ An introduction to crystal physics] (Teaching Pamphlet of the ''International Union of Crystallography'')<br> | ||

+ | Section 10.2 of ''International Tables of Crystallography, Volume A''<br> | ||

+ | Section 1.1.4 and part 3 of ''International Tables of Crystallography, Volume D'' | ||

+ | |||

+ | ---- | ||

+ | |||

+ | [[Category:Physical properties of crystals]]<br> |

## Revision as of 09:30, 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 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 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*