Volume 111, Number 5, September 2015
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||29 September 2015|
Electrocaloric effect in Ba0.2Ca0.8Ti0.95Ge0.05O3 determined by a new pyroelectric method
1 Laboratoire de Physique de la Matière Condensée, Université de Picardie - 33 rue Saint-Leu, 80039 Amiens Cedex, France
2 LMCN, F.S.T.G. Université Cadi Ayyad - BP 549, Marrakech, Morocco
3 Jozef Stefan Institute - Jamova cesta 39, 1000 Ljubljana, Slovenia
Received: 24 July 2015
Accepted: 4 September 2015
The present letter explores the electrocaloric effect (ECE) in the lead-free oxide Ba0.8Ca0.2Ti0.95Ge0.05O3 ceramics (BCTG). The electrocaloric responsivity was determined by two different methods using the Maxwell relationship . In a first well-known indirect method, hysteresis loops were measured in a wide temperature range from which the pyroelectric coefficient and thus ξ were determined by derivation of data. In the second novel method the pyroelectric coefficient pE and consequently the electrocaloric responsivity ξ were determined by direct measurements of the pyroelectric currents under different applied electric fields. Within the experimental error, good agreement was obtained between two methods with at about 410 K.
PACS: 77.70.+a – Pyroelectric and electrocaloric effects / 77.84.-s – Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials / 77.80.B- – Phase transitions and Curie point
© EPLA, 2015
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