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Effect of MgO Doping on the Phase Transformations of BaTiO 3
Author(s) -
Nagai Toru,
Iijima Kenji,
Hwang Hae Jin,
Sando Mutsuo,
Sekino Tohru,
Niihara Koichi
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01156.x
Subject(s) - orthorhombic crystal system , raman spectroscopy , tetragonal crystal system , doping , materials science , phase (matter) , dielectric , analytical chemistry (journal) , trigonal crystal system , ferroelectricity , mineralogy , crystallography , crystal structure , chemistry , optics , physics , optoelectronics , organic chemistry , chromatography
The successive phase transformations in MgO‐doped BaTiO 3 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 BaTiO 3 was decreased, and the peaks exhibited abnormally broadened profiles which are different from the one for cubic BaTiO 3 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 BaTiO 3 were stabilized at higher temperatures than pure BaTiO 3 .