| Autor: |
Hasegawa, Nao, Sasaki, Masataka, Hattori, Takahiro, Satoh, Hiroyasu, Takesada, Masaki, Onodera, Akira |
| Předmět: |
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| Zdroj: |
Ferroelectrics; 2015, Vol. 485 Issue 1, p129-135, 7p |
| Abstrakt: |
The effect of partial replacement of Cu ions by small Be cations with no d-electrons in CaCu3Ti4O12ceramics was studied over the temperature range from 90 K to 800 K. Dielectric constant of CaCu3(1−x)Be3xTi4O12decreases exponentially with increasing x as ε′ =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 ofA′-site ions is important for anomalous dielectric response in CaCu3Ti4O12at high temperatures. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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