Studies on the Solid Solution of Mn in BaTiO3
Studies on the Solid Solution of Mn in BaTiO3
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DOI：
10.1143/jjap.40.5619
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发表时间：
2001-09
影响因子：
1.5
通讯作者：
Andrei Kirianov;Nobutaka Ozaki;H. Ohsato;N. Kohzu;H. Kishi
中科院分区：
文献类型：
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作者：
Andrei Kirianov;Nobutaka Ozaki;H. Ohsato;N. Kohzu;H. Kishi
在还原性气氛（PO 2 <10-9 Pa）和空气中于1350°C保温2 h合成了0≤x≤0.04的BaTi 1-xMnxO 3固溶体。通过室温拉曼散射、电子自旋共振（ESR）和X射线粉末衍射分析，研究了不同价态Mn离子对BaTiO 3晶体结构的影响。对固溶体的晶体结构进行了分析，以确定其晶格参数的变化。结果表明，在还原气氛中，Mn ~（2+）离子促进了四方晶向立方晶的转变，随着Mn含量的增加，c轴收缩，a轴伸长。与此相反，空气合成的样品中的Mn离子促进了四方到六方的转变。六方相的形成伴随着四方相的c-轴从4.032 Ω到4.042 Ω的强烈延伸。这归因于Mn 3+离子引起的Jahn-Teller畸变。
BaTi1-xMnxO3 solid solutions with 0≤x≤0.04 were synthesized in reducing atmosphere (PO2<10-9 Pa) and in air at 1350°C for 2 h. The effect of Mn ions with different valences on the crystal structure of BaTiO3 was studied by the room-temperature Raman scattering, electron spin resonance (ESR) and X-ray powder diffraction analyses. The crystal structure of the solid solution was analyzed to determine the change of its lattice parameters. It was found that in a reducing atmosphere, Mn2+ ions promoted the tetragonal-to-cubic transformation, as both a contraction of c-axis and an extension of a-axis were observed with an increase in Mn content. In contrast, Mn ions in the air-synthesized samples promoted the tetragonal-to-hexagonal transformation. The formation of the hexagonal phase was accompanied by a strong extension of the c-axis of the tetragonal phase from 4.032 Å to 4.042 Å. This was attributed to Jahn-Teller distortions caused by Mn3+ ions.