Phase Behavior and Crystal Structure of Perovskite-Type Rare Earth Complex Oxides
来源期刊：JOURNAL OF RARE EARTHS2006年第6期
论文作者：Ryoko Katsuraya Hiromi Nakano Yusuke Tomita Tsubasa Nara Migaku Kobayashi Naoki Kamegashira
Key words：perovskite; crystal structure; X-ray diffraction; alkaline earth rare earth manganese titanium oxide;
Abstract: 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 A0.67Ln0.33Mn0.33Ti0.67O3 (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 Ca0.67Ln0.33Mn0.33Ti0.67O3 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.
Ryoko Katsuraya1，Hiromi Nakano2，Yusuke Tomita1，Tsubasa Nara1，Migaku Kobayashi1，Naoki Kamegashira3
(1.Department of Chemistry and Biochemistry, Numazu College of Technology, 3600 Ooka, Numazu 410-8501, Japan;
2.Ryukoku University, Seta, Otsu 520-2194, Japan;
3.Department of Materials Science, Toyohashi University of Technology, Tempaku-cho, Toyohashi 441-8580, Japan)
Abstract: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 A0.67Ln0.33Mn0.33Ti0.67O3 (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 Ca0.67Ln0.33Mn0.33Ti0.67O3 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.
Key words:perovskite; crystal structure; X-ray diffraction; alkaline earth rare earth manganese titanium oxide;
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