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Modeling of Dielectric Behaviors of Multilayer Ceramic Capacitors Under a Direct Current Bias Field
Author(s) -
Wen Hai,
Wang Xiaohui,
Chen Renzheng,
Li Longtu
Publication year - 2006
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.1551-2916.2005.00742.x
Subject(s) - ceramic capacitor , dielectric , materials science , capacitance , capacitor , microstructure , dc bias , composite material , ceramic , direct current , condensed matter physics , electrode , optoelectronics , chemistry , electrical engineering , voltage , physics , engineering
A modified Campbell model has been provided considering the internal stress and the “core‐shell” microstructure that occurs in X7R‐type multilayer ceramic capacitors (MLCCs). The capacitance stability coefficient α was defined to denote the effect of a direct current (DC) bias field on the capacitance of MLCCs. According to this model, the dielectric constant will decrease with DC bias field while the α coefficient will increase. The dielectric properties of MLCCs with different active layers, sintering temperatures, grain size, and strontium doping concentration were measured in order to verify the validity of the model. The experimental results exhibited good agreement with the model, which provided qualitative explanations.