Mossbauer Studies on the Phase Transition in the Sr_2(FeW)O_6-Ba_2(FeW)O_6 System
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概要
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Tetragonal-cubic phase transitions in the Sr_2(FeW)O_6-Ba_2(FeW)O_6 system were investigated by means of X-ray diffraction and Mossbauer effect in the temperature range from room temperature to about 400℃. Sr_2(FeW)O_6 undergoes a phase transition at about 350℃. The transition temperature decreases almost linearly by replacing Sr^<2+> ions by Ba^<2+> ions. Room temperature Mossbauer spectra of the system, with the exception of Ba_2(FeW)O_6, are characterized by the appearance of two well separated absorption peaks due to the quadrupole interaction of Fe^<2+> ions. Temperature dependence of the quadrupole splitting of Sr_2(FeW)O_6 is compared with that of the tetragonality. Cubic Ba_2(FeW)O_6 has a single absorption peak (δ=1.39 mm/sec) in the Mossbarer spectra. Due to the disordered arrangement of Sr^<2+> and Ba^<2+> ions, quadrupole splittings are observed even in the cubic phase of the system.
- 社団法人日本物理学会の論文
- 1970-09-05
著者
-
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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