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Ultra‐Wide Temperature Stable Dielectrics Based on Bi 0.5 Na 0.5 TiO 3 –NaNbO 3 System
Author(s) -
Xu Qi,
Song Zhe,
Tang Wenlin,
Hao Hua,
Zhang Lin,
Appiah Millicent,
Cao Minghe,
Yao Zhonghua,
He Zichen,
Liu Hanxing
Publication year - 2015
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.13693
Subject(s) - dielectric , materials science , temperature coefficient , atmospheric temperature range , capacitor , ferroelectricity , analytical chemistry (journal) , perovskite (structure) , microstructure , capacitance , impurity , ceramic , ceramic capacitor , phase (matter) , dielectric loss , crystallography , optoelectronics , chemistry , composite material , electrical engineering , voltage , thermodynamics , electrode , physics , organic chemistry , chromatography , engineering
The microstructure, phase structure, ferroelectric, and dielectric properties of (1− x )Bi 0.5 Na 0.5 TiO 3 ‐ x NaNbO 3 [(1− x ) BNT ‐ x NN] ceramics conventionally sintered in the temperature range of 1080°C–1120°C were investigated as a candidate for capacitor dielectrics with wide temperature stability. Perovskite phase with no secondary impurity was observed by XRD measurement. With increasing NN content, (1− x ) BNT ‐ x NN was found to gradually transform from ferroelectric ( x = 0–0.05) to relaxor ( x = 0.10–0.20) and then to paraelectric state ( x = 0.25–0.35) at room temperature, indicated by P – I – E loops analysis, associated with greatly enhanced dielectric temperature stability. For the samples with x = 0.25–0.35, the temperature coefficient of capacitance ( TCC ) was found <11% in an ultra‐wide temperature range of −60°C–400°C with moderate dielectric constant and low dielectric loss, promising for temperature stable capacitor applications.