期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 83, 期 1, 页码 107-112出版社
WILEY
DOI: 10.1111/j.1151-2916.2000.tb01156.x
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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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