X-Ray and Mossbauer Studies in the Sr(FeTa)_1/2O_3 and Sr(CrTa)_<1/2>O_3 System
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概要
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Sr(FeTa)_<1/2>O_3 is a disordered perovskite, tetragonal at room temperature, while Sr(CrTa)_<1/2>O_3 is an ordered perovskite, cubic at room temperature. These compounds make solid solutions in the whole range of composition. Tetragonal-cubic transition occurs at about 90 mol% of Sr(FeTa)_<1/2>O_3. Intensity of superstructure line of X-ray diffraction which shows the ordered arrangement of the B ions decreases gradually with increase of Sr(FeTa)_<1/2>O_3. Isomer shift is nearly constant, 0.64 mm/sec, for all compounds, the value of which is reasonable for Fe^<3+>. The curve of the quadrupole splitting vs composition is rather complicated. We can give it a qualitative interpratation in terms of local distortion arising form the disordered distribution of the Ta, xFe and (1-x)Cr ions.
- 社団法人日本物理学会の論文
- 1971-02-05
著者
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Nakagawa Takehiko
Department Of Physical Electronics Tokyo Institute Of Technology
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Nakagawa Takehiko
Department Of Physical Electronics Faculty Of Engineering Tokyo Institute Of Technology
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Nomura Shoichiro
Department Of Physical Electornics Faculty Of Engineering Tokyo Institute Of Technology
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Nomura Shoichiro
Department Of Physical Electronics Tokyo Institute Technology
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