Effect of MgO doping on the phase transformations of BaTiO3

被引:86
作者
Nagai, T
Iijima, K
Hwang, HJ
Sando, M
Sekino, T
Niihara, K
机构
[1] Fine Ceram Res Assoc, Kita Ku, Nagoya, Aichi 462, Japan
[2] Natl Ind Res Inst Nagoya, Kita Ku, Nagoya, Aichi 462, Japan
[3] Osaka Univ, Inst Sci & Ind Res, Ibaraki, Osaka 567, Japan
关键词
D O I
10.1111/j.1151-2916.2000.tb01156.x
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The successive phase transformations in MgO-doped BaTiO3 were studied. Upon MgO doping, dielectric anomalies corresponding to lower phase transformations were broadened and depressed, while an anomaly for a cubic-tetragonal transformation remained and shifted to a lower temperature. XRD peak splitting upon tetragonality of BaTiO3 was decreased, and the peaks exhibited abnormally broadened profiles which are different from the one for cubic BaTiO3 above T-c. Raman spectroscopy revealed the existence of orthorhombic phase at room temperature for the solid solution with 0.5 mol% or more MgO. The temperature dependence of the Raman spectrum showed that orthorhombic and rhombohedral phases in MgO doped BaTiO3 were stabilized at higher temperatures than pure BaTiO3.
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页码:107 / 112
页数:6
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