Journal
APPLIED PHYSICS LETTERS
Volume 106, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4921744
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Funding
- Slovenian Centre of Excellence NAMASTE
- Slovenian Research Agency [L2-6768, P2-0105, P1-0125, J2-6779-1]
- European Social Fund [PE3 1535]
- Greek State
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The electrocaloric effect (ECE), i.e., the adiabatic temperature change DTEC, of the lead-free relaxor ferroelectric 0.85K(0.5)Na(0.5)NbO(3)-0.15SrTiO(3) (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 DTEC exceeding 1.2K at 300K and 1.9K at 340K 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. (C) 2015 AIP Publishing LLC.
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