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High electrocaloric effect in hot‐pressed Pb 0.85 La 0.1 (Zr 0.65 Ti 0.35 )O 3 ceramics with a wide operating temperature range
Author(s) -
Zhang Guangzu,
Chen Mo,
Fan Baoyan,
Liu Yang,
Li Mingyu,
Jiang Shenglin,
Huang Houbing,
Liu Huan,
Li Honglang,
Wang Qing
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14984
Subject(s) - materials science , sintering , ceramic , electrical resistivity and conductivity , electrocaloric effect , dielectric , ferroelectricity , atmospheric temperature range , hot pressing , analytical chemistry (journal) , electric field , composite material , mineralogy , optoelectronics , electrical engineering , thermodynamics , chemistry , physics , chromatography , engineering , quantum mechanics
The temperature stability of the electrocaloric effect ( ECE ) in relaxor ferroelectric Pb 0.85 La 0.1 (Zr 0.65 Ti 0.35 )O 3 ( PLZT ) prepared by the hot‐press sintering method has been investigated. Compared to the PLZT s prepared via the conventional sintering process, the hot‐pressed PLZT s exhibit larger ECE and superior temperature stability. The hot‐pressed sample with an appropriate content of excess PbO presents a high Δ T of 2.4°C and Δ S of 2.3 J kg −1 ·K −1 , both of which are 30% greater than those of the conventionally sintered samples measured at 100 kV ·cm −1 . More importantly, the hot‐pressed specimens display great stable electrical properties, including the dielectric breakdown strength and electrical resistivity in the temperature range from 0°C to 100°C, whose ECE instability, especially, is only one‐half that of the samples prepared by the conventional solid‐state method. In addition, the ECE and its stability of the hot‐pressed sample can be further enhanced by increasing the operating electric field to a relatively high level of 200 kV ·cm −1 . This work demonstrates hot‐press sintering is an effective method to fabricate ferroelectric ceramics with high ECE as well as desirable temperature stability.