期刊
JOURNAL OF ELECTROCERAMICS
卷 6, 期 3, 页码 219-232出版社
KLUWER ACADEMIC PUBL
DOI: 10.1023/A:1011400630449
关键词
doping mechanisms; defects; phase equilibria; conductivity; impedance spectroscopy
The mechanism of doping BaTiO3 with La has been investigated by a combination of X-ray diffraction, electron probe microanalysis, scanning and transmission electron microscopy and impedance measurements. Phase diagram results confirm that the principal doping mechanism involves ionic compensation through the creation of titanium vacancies. All samples heated in oxygen at 1350-1400 degreesC are electrical insulators, consistent with an ionic compensation mechanism. Samples heated in air or atmospheres of low oxygen partial pressure, at similar temperatures, lose a small amount of oxygen and this gives rise to a second, electronic compensation mechanism in addition to the main, ionic compensation mechanism; as a result, samples are dark-coloured and semiconducting. The change from insulating to semiconducting behaviour is reversible, by changing the atmosphere on heating at 1350-1400 degreesC. We find no evidence for any changes in cationic composition of the BaTiO3 solid solutions arising from changes in oxygen content.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据