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J. Korean Ceram. Soc. > Volume 46(2); 2009 > Article
Journal of the Korean Ceramic Society 2009;46(2): 219.
doi: https://doi.org/10.4191/kcers.2009.46.2.219
직류 전계에 의한 Acceptor 첨가 BaTiO3의 유전특성 열화 현상
한동우, 한영호
성균관대학교 신소재공학부
Capacitance Aging Behavior of Acceptor-Doped BaTiO3 under DC Electrical Field
Dong-Woo Hahn, Young-Ho Han
Department of Materials Engineering, Sungkyunkwan University
ABSTRACT
Effects of MgO or $R_2O_3$(R:Dy, Ho, Yb) on the capacitance aging behavior of multilayer ceramic capacitors (MLCCs) based on $BaTiO_3$ dielectrics under DC electrical fields has been studied. At a DC field of 1 $V{/mu}m$, the capacitance of MLCC specimens dropped immediately in a very short period (<10 s, the first stage) and then decreased continuously with time (the second stage). Mn doping significantly increased the aging rate in the second stage. The addition of MgO or $R_2O_3$ notably decreased the second stage aging rate of Mn-doped specimens. Yb doping gives rise to the lowest aging rate in the second stage, which is due to the larger population of defect dipoles associated with oxygen vacancies.
Key words: DC bias, Capacitance aging, Reliability, $BaTiO_3$, Rare earth oxides
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