Electrocaloric effect in Ba0.2Ca0.8Ti0.95Ge0.05O3 determined by a new pyroelectric method. (28th September 2015)

• Record Type: Journal Article
• Authors: Asbani, B.; Dellis, J.-L.; Gagou, Y.; Kaddoussi, H.; Lahmar, A.; Amjoud, M.; Mezzane, D.; Kutnjak, Z.; El Marssi, M.
• Is Part Of: Europhysics letters. Volume 111:Number 5(2015:Sep.)
• Publication Date: 2015-09-28
• Subjects: 77.70.+a -- 77.84.-s -- 77.80.B-; Physics -- Periodicals; Electronic journals; 530.05
• DOI: 10.1209/0295-5075/111/57008
• Languages: English
• ISSNs: 0295-5075

Abstract

Abstract: The present letter explores the electrocaloric effect (ECE) in the lead-free oxide Ba0.8 Ca0.2 Ti0.95 Ge0.05 O3 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 p E 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.