A ferroelectric barium titanate, BaTi2O5
A ferroelectric barium titanate, BaTi2O5
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DOI：
10.1107/s0108270103021395
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发表时间：
2003-12-01
期刊：
影响因子：
--
通讯作者：
Akashi, T
中科院分区：
文献类型：
--
作者：
Kimura, T;Goto, T;Akashi, T
用x射线衍射研究了浮区法合成的五氧化二钛钡BaTi2O5的晶体结构。先前的报道将该结构描述为单斜中心对称空间群C2/m。我们最近发现这种材料表现出铁电性，因此BaTi2O5应该具有较低的对称性。BaTi2O5的晶体结构在C2空间群中得到细化，显示出Ti原子沿b轴的位移。这一结果与BaTi2O5的铁电性只在b轴上观察到的事实是一致的。
The crystal structure of monobarium dititanium pentaoxide, BaTi2O5, synthesized by a floating-zone method, was studied by X-ray diffraction. Previous reports describe the structure as being in the monoclinic centrosymmetric space group C2/m. We have recently found that this material exhibits ferroelectricity, and therefore BaTi2O5 should have lower symmetry. The crystal structure of BaTi2O5 was refined in space group C2, revealing a displacement of the Ti atoms along the b axis. This result is consistent with the fact that the ferroelectricity of BaTi2O5 was only observed along the b axis.