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The Effect of Excess PbO on Dielectric and Pyroelectric Properties of Lead Scandium Tantalate Ceramics
Author(s) -
Liu Wei,
Wang Genshui,
Cao Sheng,
Mao Chaoliang,
Cao Fei,
Dong Xianlin
Publication year - 2010
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/j.1551-2916.2010.03767.x
Subject(s) - pyroelectricity , dielectric , materials science , tantalate , scandium , curie temperature , ceramic , analytical chemistry (journal) , perovskite (structure) , figure of merit , lithium tantalate , atmospheric temperature range , grain size , dielectric loss , mineralogy , ferroelectricity , chemistry , composite material , condensed matter physics , crystallography , metallurgy , thermodynamics , optoelectronics , physics , chromatography , ferromagnetism , lithium niobate
Lead scandium tantalate (PbSc 0.5 Ta 0.5 O 3 , or PST) ceramics with the addition of 0.5–10 wt% excess PbO were fabricated by the hot‐pressing method. The percent of perovskite PST and the long‐range order parameter S were quantitatively characterized by X‐ray diffraction analysis. The grain size was measured by scanning electron microscopy. The dielectric and pyroelectric behavior under dc bias were investigated from −20° to –50°C. The relationships among dielectric constant, Curie temperature, and dc bias were analyzed by fitting to the Gibbs free energy formulas. Based on these data, the pyroelectric figures of merit F d as a function of field and temperature were calculated, and the highest F d of 15 × 10 −5 Pa −1/2 was obtained under 700 V/mm in the sample with 5 wt% excess PbO.