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Defect structure‐electrical property relationship in Mn‐doped calcium strontium titanate dielectric ceramics
Author(s) -
Zhang Lin,
Hao Hua,
Zhang Shujun,
Lanagan Michael T.,
Yao Zhonghua,
Xu Qi,
Xie Juan,
Zhou Jing,
Cao Minghe,
Liu Hanxing
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.14994
Subject(s) - strontium titanate , dielectric , materials science , activation energy , doping , electron paramagnetic resonance , analytical chemistry (journal) , dopant , dipole , ceramic , nuclear magnetic resonance , mineralogy , chemistry , optoelectronics , organic chemistry , composite material , physics , chromatography
Ca 0.6 Sr 0.4 TiO 3 ( CST ) ceramics with different amounts of Mn dopant (0‐2.0 mol%) were prepared by solid‐state reaction method. The electric field and temperature stability of energy storage performance was found to be greatly enhanced with moderate doped level of 0.5 mol%. The dielectric loss‐frequency spectra revealed the existence and evolution of defect dipoles at elevated temperature, which was confirmed directly by electron paramagnetic resonance ( EPR ) spectra. The response of defect dipoles was characterized by thermally stimulated depolarization current ( TSDC ), where the activation energy and the concentration evolution of defect dipoles were calculated, with the highest values observed for 0.5% doped samples. The dissociation of defect dipoles and the movement of free V O · ·were analyzed by high‐temperature impedance spectra analysis, with the activation energy of 1.04‐1.60 eV , and 0.5% doped samples also demonstrated the highest E a . The relationship between microscopic defect structure and macroscopic electrical behavior was established in this work.