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http://dx.doi.org/10.4313/JKEM.2015.28.10.615

Electrocaloric Effect of 8/65/35 PLZT Ceramics Sintered at Low Temperature  

Choi, Seung-Hun (Department of Electrical Engineering, Semyung University)
Ra, Cheol-Min (Department of Electrical Engineering, Semyung University)
Yooa, Ju-Hyun (Department of Electrical Engineering, Semyung University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.28, no.10, 2015 , pp. 615-619 More about this Journal
Abstract
In this study, in order to develop the composition ceramics with the excellent electrocaloric properties, 8/65/35 PLZT ceramics were fabricated by the conventional solid-state method with the addition of $Bi_2O_3$, CuO, $Li_2CO_3$ and the variation of sintering temperature from $930^{\circ}C$ to $990^{\circ}C$. The XRD pattern of all specimens indicated general perovskite structure and the rhombohedral phase were observed. Curie temperature ($T_c$) of all specimens was observed in the vicinity of about $190^{\circ}C$. Density, coercive field and remnant polarization of the specimen sintered at $950^{\circ}C$ was $7.55g/cm^3$, 8.895 kV/cm, $11.22{\mu}C/cm^2$, respectively. EC effect of PLZT ceramics was measured by indirect method and the temperature change ${\Delta}T$ due to the electrocaloric effect was calculated by Maxwell's relations. ${\Delta}T$ of ceramic sintered at $950^{\circ}C$ was $0.21^{\circ}C$ under application of 40 kV/cm at $190^{\circ}C$.
Keywords
Electrocaloric effects; Ceramics; PLZT; Ferroelectric; ${\Delta}T$;
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Times Cited By KSCI : 1  (Citation Analysis)
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