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Large electrocaloric effect in lead-free K0.5Na0.5NbO3-SrTiO3 ceramics

Koruza, Jurij and Rožič, B. and Cordoyiannis, G. and Malič, Barbara and Kutnjak, Z. (2015):
Large electrocaloric effect in lead-free K0.5Na0.5NbO3-SrTiO3 ceramics.
In: Applied Physics Letters, p. 202905, 106, (20), ISSN 0003-6951, [Online-Edition: http://dx.doi.org/10.1063/1.4921744],
[Article]

Abstract

The electrocaloric effect (ECE), i.e., the adiabatic temperature change ΔT EC, of the lead-free relaxor ferroelectric 0.85K0.5Na0.5NbO3-0.15SrTiO3 (KNN-STO) ceramics is investigated. The ECE data obtained by a direct method show the existence of a large ECE near the temperature of the dielectric permittivity maximum. Due to the high break-down electric field, a large ΔT EC exceeding 1.2 K at 300 K and 1.9 K at 340 K was observed at 159 kV/cm in a broad temperature range of 80 K. Such a high ECE response near the room temperature is comparable to that found in lead-based ceramic materials, thus making KNN-STO a strong candidate to replace lead-based materials in future electrocaloric applications.

Item Type: Article
Erschienen: 2015
Creators: Koruza, Jurij and Rožič, B. and Cordoyiannis, G. and Malič, Barbara and Kutnjak, Z.
Title: Large electrocaloric effect in lead-free K0.5Na0.5NbO3-SrTiO3 ceramics
Language: English
Abstract:

The electrocaloric effect (ECE), i.e., the adiabatic temperature change ΔT EC, of the lead-free relaxor ferroelectric 0.85K0.5Na0.5NbO3-0.15SrTiO3 (KNN-STO) ceramics is investigated. The ECE data obtained by a direct method show the existence of a large ECE near the temperature of the dielectric permittivity maximum. Due to the high break-down electric field, a large ΔT EC exceeding 1.2 K at 300 K and 1.9 K at 340 K was observed at 159 kV/cm in a broad temperature range of 80 K. Such a high ECE response near the room temperature is comparable to that found in lead-based ceramic materials, thus making KNN-STO a strong candidate to replace lead-based materials in future electrocaloric applications.

Journal or Publication Title: Applied Physics Letters
Volume: 106
Number: 20
Uncontrolled Keywords: Relaxor ferroelectrics; Ceramics; Electric fields; Ferroelectric materials; Dielectric oxides
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: 22 May 2015 07:48
Official URL: http://dx.doi.org/10.1063/1.4921744
Identification Number: doi:10.1063/1.4921744
Funders: This work was supported by the Slovenian Centre of Excellence NAMASTE and the Slovenian Research Agency through Grant Nos. L2-6768, P2-0105, P1-0125, and J2-6779-1. G.C. acknowledges the support of Project PE3 1535 within the Action, “Supporting Postdoctoral Researchers of the Operational Program “Education and Lifelong Learning”,” co-financed by the European Social Fund and the Greek State.
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