Phase behavior and crystal structure of perovskite-type rare earth complex oxides
Phase behavior and crystal structure of perovskite-type rare earth complex oxides
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DOI：
10.1016/s1002-0721(07)60006-4
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发表时间：
2006-12-01
影响因子：
4.9
通讯作者：
Kamegashira, Naoki
中科院分区：
文献类型：
--
作者：
Kobayashi, Migaku;Katsuraya, Ryoko;Kamegashira, Naoki
在氩气中合成了几种含锰和钛的稀土复合氧化物化合物，并通过粉末X射线衍射数据和Rietveld方法分析了它们的晶体结构。发现A(0.67)Ln(0.33)Mn0.33Ti0.67O3(A=Ca或Sr，Ln=稀土)的结构与空间群Pnma具有斜方对称性，并得到了它们的原子间距离和键角。这个空间群也是从电子显微镜研究中衍生出来的。 Ca(0.6)7Ln(0.33)Mn(0.33)Ti(0.67)O(3)对几种稀土元素的电导率表现出半导体特性，活化能为0.4 eV。其中一些锶系化合物在 10 K 以下表现出反铁磁特性。
Several compounds of rare earth complex oxides containing manganese and titanium were synthesized in Ar, and their crystal structures were analyzed by powder X-ray diffraction data and Rietveld method. Structures of A(0.67)Ln(0.33) Mn0.33Ti0.67O3(A = Ca or Sr and Ln = rare earth) were found to have orthorhombic symmetry with the space group Pnma, and their interatomic distances and bond angles were obtained. This space group was also derived from electron microscopic study. Electrical conductivity of Ca(0.6)7Ln(0.33)Mn(0.33)Ti(0.67)O(3) for several rare earth elements showed a semiconducting property with the activation energy of 0.4 eV. Some of these compounds of the strontium system show the antiferromagnetic properties below 10 K.