View source for Electrocaloric effect

<font color="blue">Effet électrocalorique</font> (''Fr''). <font color="red">Elektrokalorischer Effekt</font> (''Ge''). <font color="black">Effetto electrocalorico</font> (''It''). <font color="green">Efecto electrocalórico</font> (''Sp'').

== 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 applied 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 also ==
*[[Pyroelectricity]]
*[http://www.iucr.org/iucr-top/comm/cteach/pamphlets/18/ ''An introduction to crystal physics'']  (Teaching Pamphlet No. 18 of the International Union of Crystallography)
*Chapters 1.1.4 and Part 3 of ''International Tables for Crystallography, Volume D''

[[Category:Physical properties of crystals]]