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

J. Koruza; B. Rožič; G. Cordoyiannis; B. Malič; Z. Kutnjak

doi:10.1063/1.4921744

Large electrocaloric effect in lead-free K_0.5Na_0.5NbO₃-SrTiO₃ ceramics

J. Koruza, B. Rožič, G. Cordoyiannis, B. Malič, Z. Kutnjak

Research output: Contribution to journal › Article › peer-review

Abstract

The electrocaloric effect (ECE), i.e., the adiabatic temperature change ΔT_EC, of the lead-free relaxor ferroelectric 0.85K_0.5Na_0.5NbO₃-0.15SrTiO₃ (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.

Original language	English
Article number	202905
Journal	Applied Physics Letters
Volume	106
Issue number	20
DOIs	https://doi.org/10.1063/1.4921744
Publication status	Published - 18 May 2015
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4921744

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title = "Large electrocaloric effect in lead-free K0.5Na0.5NbO3-SrTiO3 ceramics",

abstract = "The electrocaloric effect (ECE), i.e., the adiabatic temperature change ΔTEC, 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 ΔTEC 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.",

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AU - Koruza, J.

AU - Rožič, B.

AU - Cordoyiannis, G.

AU - Malič, B.

AU - Kutnjak, Z.

PY - 2015/5/18

Y1 - 2015/5/18

N2 - The electrocaloric effect (ECE), i.e., the adiabatic temperature change ΔTEC, 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 ΔTEC 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.

AB - The electrocaloric effect (ECE), i.e., the adiabatic temperature change ΔTEC, 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 ΔTEC 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.

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Large electrocaloric effect in lead-free K_0.5Na_0.5NbO₃-SrTiO₃ ceramics

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