Influence of Mn doping on the semiconducting properties of CaCu3Ti4O12 ceramics
Influence of Mn doping on the semiconducting properties of CaCu3Ti4O12 ceramics
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DOI：
10.1063/1.2200732
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发表时间：
2006-06
影响因子：
4
通讯作者：
Ming Li;A. Feteira;D. Sinclair;A. West
中科院分区：
文献类型：
--
作者：
Ming Li;A. Feteira;D. Sinclair;A. West
对未掺杂的CaCu3Ti4O12(CCTO)和CaCu2.94Mn0.06Ti4O12CCMTO陶瓷的交流阻抗谱数据的比较表明，Mn掺杂使CCTO的∼0.01Scm−1的室温体半导性降低了6个数量级。CCMTO陶瓷的体电导量和激活能与CCTO陶瓷中绝缘晶界的大小和激活能相似。提出了一个解释CCMTO陶瓷体电导率抑制的模型：CCTO陶瓷的晶界和晶界区域可能由相同的相组成，但成分略有不同。
Comparison of impedance spectroscopy data for undoped CaCu3Ti4O12 (CCTO) and CaCu2.94Mn0.06Ti4O12 CCMTO ceramics shows Mn doping to suppress the room temperature bulk semiconductivity of ∼0.01Scm−1 for CCTO by six orders of magnitude. The magnitude of and activation energy for bulk conduction in CCMTO are similar to those of the insulating grain boundaries in CCTO ceramics. A model to explain the suppression of the bulk conductivity in CCMTO ceramics is proposed; the grain and grain boundary regions in CCTO ceramics may consist of the same phase but with slightly different compositions.