Anomalous Dielectric Behavior in A-site Ordered Perovskite CaCu^sub 3^Ti^sub 4^O^sub 12^ : Effect of A'-site Doping

Anomalous Dielectric Behavior in A-site Ordered Perovskite CaCu^sub 3^Ti^sub 4^O^sub 12^ : Effect of A'-site Doping

The effect of partial replacement of Cu ions by small Be cations with no d-electrons in ... ceramics was studied over the temperature range from 90 K to 800 K. Dielectric constant of ... decreases exponentially with increasing x as e' =4000 + exp(-x/0.023); by 5% of Be-doping, the relaxation ti...

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Bibliographic Details
Published in:Ferroelectrics Vol. 485; no. 1; p. 129
Main Authors: Hasegawa, Nao, Sasaki, Masataka, Hattori, Takahiro, Satoh, Hiroyasu, Takesada, Masaki, Onodera, Akira
Format: Journal Article
Language:English
Published: Philadelphia Taylor & Francis Ltd 01-01-2015
Subjects:
Ceramics
Dielectric properties
Ferroelectrics
Ions
Perovskite
Semiconductor doping
Temperature effects
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Summary:The effect of partial replacement of Cu ions by small Be cations with no d-electrons in ... ceramics was studied over the temperature range from 90 K to 800 K. Dielectric constant of ... decreases exponentially with increasing x as e' =4000 + exp(-x/0.023); by 5% of Be-doping, the relaxation time and activation energy decrease to values of 50% and 92% compared with those in pure CCTO, respectively. The weakened hybridization in Cu-O bonds by Be-doping suppresses dielectric properties. This evidence indicates that the role of A'-site ions is important for anomalous dielectric response in ... at high temperatures. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0015-0193
1563-5112