MOSSBAUER STUDY OF MIXED CRYSTALLINE (EU2O3)(X)(FE2O3)(1-X)(X=0.45)

The crystallography and the temperature dependence of the Mossbauer pa rameters of mixed crystalline (Eu2O3)(x)(Fe2O3)(1-x) (x = 0.45) were s tudied by the methods of X-ray diffraction at room temperature and Mos sbauer spectroscopy within the temperature range from liquid nitrogen temperature to 540 K. The X-ray diffraction pattern of the sample show ed the coexistence of cubic and orthorhombic crystal phases. The Mossb auer spectrum of 540 K indicated a crystal phase which was in good agr eement with the X-ray result and gave no indication, within the experi mental error, of any other crystal phases. By analyzing the temperatur e dependence of the Mossbauer parameters by using the spin-wave theory and the Debye model, useful results were obtained for examining the c hanges in the physical properties in mixed crystalline system.