Electrocaloric effect

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<Font color="blue"> Effet électrocalorifique </Font> (''Fr''). 

== Definition ==

The electrocaloric effect is the converse of the pyroelectric effect: it describes the variation of entropy &delta;&sigma; of a material submitted to an electrical field ''E<sub>i</sub> '':
<center>
''&delta;&sigma;'' =  ''p<sub>i</sub><sup>T</sup>'' ''E<sub>i</sub> ''
</center>

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

== See [[pyroelectricity]] ==

== 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''

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

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