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Strong electrocaloric effect in lead-free 0.65Ba(Zr0.2Ti0.8)O3-0.35(Ba0.7Ca0.3)TiO3 ceramics obtained by direct measurements

Sanlialp, Mehmet and Shvartsman, Vladimir V. and Acosta, Matias and Dkhil, Brahim and Lupascu, Doru C. (2015):
Strong electrocaloric effect in lead-free 0.65Ba(Zr0.2Ti0.8)O3-0.35(Ba0.7Ca0.3)TiO3 ceramics obtained by direct measurements.
In: Applied Physics Letters, pp. 062901, 106, (6), ISSN 0003-6951,
[Online-Edition: http://dx.doi.org/10.1063/1.4907774],
[Article]

Abstract

Solid solutions of (1 − x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 promise to exhibit a large electrocaloric effect (ECE), because their Curie temperature and a multiphase coexistence region lie near room temperature. We report on direct measurements of the electrocaloric effect in bulk ceramics 0.65Ba(Zr0.2Ti0.8)O3-0.35(Ba0.7Ca0.3)TiO3 using a modified differential scanning calorimeter. The adiabatic temperature change reaches a value of ΔTEC  = 0.33 K at ∼65 °C under an electric field of 20 kV/cm. It remains sizeable in a broad temperature interval above this temperature. Direct measurements of the ECE proved that the temperature change exceeds the indirect estimates derived from Maxwell relations by about ∼50%. The discrepancy is attributed to the relaxor character of this material.

Item Type: Article
Erschienen: 2015
Creators: Sanlialp, Mehmet and Shvartsman, Vladimir V. and Acosta, Matias and Dkhil, Brahim and Lupascu, Doru C.
Title: Strong electrocaloric effect in lead-free 0.65Ba(Zr0.2Ti0.8)O3-0.35(Ba0.7Ca0.3)TiO3 ceramics obtained by direct measurements
Language: English
Abstract:

Solid solutions of (1 − x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 promise to exhibit a large electrocaloric effect (ECE), because their Curie temperature and a multiphase coexistence region lie near room temperature. We report on direct measurements of the electrocaloric effect in bulk ceramics 0.65Ba(Zr0.2Ti0.8)O3-0.35(Ba0.7Ca0.3)TiO3 using a modified differential scanning calorimeter. The adiabatic temperature change reaches a value of ΔTEC  = 0.33 K at ∼65 °C under an electric field of 20 kV/cm. It remains sizeable in a broad temperature interval above this temperature. Direct measurements of the ECE proved that the temperature change exceeds the indirect estimates derived from Maxwell relations by about ∼50%. The discrepancy is attributed to the relaxor character of this material.

Journal or Publication Title: Applied Physics Letters
Volume: 106
Number: 6
Uncontrolled Keywords: Electric fields; Relaxor ferroelectrics; Ceramics; Ferroelectric materials; Ferroelectric phase transitions
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 10 Feb 2015 09:14
Official URL: http://dx.doi.org/10.1063/1.4907774
Identification Number: doi:10.1063/1.4907774
Funders: This work was supported by Deutsche Forschungsgemeinschaft, DFG, in the framework of the priority program “Ferroic Cooling” (SPP1599, Lu729/15-1) as well by the Leibniz program under RO954/22-1.
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