ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 35, Number 6
JKCSEZ 35(6)
December 20, 1991 

Nonstoichiometric solid solutions of Y1-xAxFeO3-y (A = Ca, Sr) systems with perovskite structure were prepared for x = 0.00, 0.25, 0.50, 0.75 and 1.00 at 1200℃ under atmospheric pressure, respectively. Crystallographic structures of the solid solutions of all compositions have been determined by the analysis of X-ray diffraction patterns. Reduced lattice volume of the Y1-xCaxFeO3-y system was decreased with increasing x value and that of the Y1-xSrxFeO3-y system was increased with increasing the x value. The mole ratios of Fe4+ to Fe3+,τ, values in the solid solutions have been determined by Mohr salt's method of analysis and then the mixed valency was identified by Mossbauer spectroscopic analysis at 298 K. The y values were calculated from the x and τ, and then nonstoichiometric chemical formulas were fixed. The conduction mechanism could be explained by hopping model of the conduction electrons between the mixed valence states.