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Influence of BaO–CaO–SiO 2 on dielectric properties and reliability of BaTiO 3 ‐based ceramics
Author(s) -
Zhao Qiancheng,
Gong Huiling,
Wang Xiaohui,
Luo Bingcheng,
Li Longtu
Publication year - 2016
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201532706
Subject(s) - materials science , dielectric , ceramic , analytical chemistry (journal) , acceptor , relaxation (psychology) , doping , oxide , degradation (telecommunications) , polarization (electrochemistry) , enthalpy , mineralogy , condensed matter physics , composite material , thermodynamics , electronic engineering , chemistry , metallurgy , optoelectronics , physics , psychology , social psychology , chromatography , engineering
The dielectric properties and resistance degradation behavior of BCG‐doped BaTiO 3 ‐based ceramics were investigated, where BCG consists of BaO, CaO, and SiO 2 . In oxide ceramics, oxygen vacancies have an important effect on degradation behaviors. X‐ray diffraction was employed to analyze the occupancy of Ca 2+ in the Ba sites or Ti sites with different BCG contents. For the light‐doped, Ca 2+ mainly occupy the Ba sites resulting in a decrease of lattice parameters and thus an increase in the enthalpy of reduction which might limit the concentration of oxygen vacancies. However, acceptor defects,C a ″T iwhich could trap the forming electrons at room temperature but deteriorate the resistance degradation behavior at high temperature, would be generated with excessive BCG contents. Moreover, thermally stimulated depolarization current (TSDC) analysis was carried out to analyze the defect relaxation behavior and the actual concentration. The resistance degradation can be correlated with the depolarization current strength ( J max ) and the relaxation temperature ( T m ) versus polarization condition.