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Preparation and Characterization of (1 — x ) Pb(Mg 1/3 Nb 2/3 ) O 3 — x PbTiO 3 Electrocaloric Ceramics
Author(s) -
Zhang R.,
Peng S.,
Xiao D.,
Wang Y.,
Yang B.,
Zhu J.,
Yu P.,
Zhang W.
Publication year - 1998
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/(sici)1521-4079(1998)33:5<827::aid-crat827>3.0.co;2-h
Subject(s) - materials science , electrocaloric effect , ceramic , ferroelectricity , sintering , ferroelectric ceramics , perovskite (structure) , titanate , dielectric , electric field , analytical chemistry (journal) , mineralogy , crystallography , metallurgy , optoelectronics , chemistry , organic chemistry , physics , quantum mechanics
Lead magnesium niobate Pb(Mg 1/3 Nb 2/3 )O 3 — lead titanate PbTiO 3 [abbr. as (1 — x ) PMN — x PT] ferroelectric ceramics with different excesses of MgO and PbO were systematically studied under different processing conditions for ferroelectric refrigeration application. It was found that the excess amount of MgO and PbO, and the sintering temperature have great effect on the crystallographic properties of the ceramics. In our experiments, (1 — x ) PMN — x PT ( x = 0.08, x = 0.10, and x = 0.25 respectively) with the excesses of 2 mol% MgO and 2 mol% PbO ceramics sintered at 1250 °C/1 hour possess the desired perovskite structures and large electrocaloric temperature change (Δ T = 1 K and more) in the vicinity of room temperature under a dc electric field of 1.5 kV/mm. It is expected that (1 — x ) PMN — x PT electrocaloric ceramics could be applied for cascade refrigeration near room temperature.