Abstract: Pervoskite oxides of LaFe_1-xNi_xO₃(x=0.1～0.6)were prepared by the solid state reaction method.The XRD, IRand Mossbauer measurements show that the samples are all in single phase except for x=0.4; their structures transform from orthorhombic to rhomhombic at x=0. 5.The frequency of Fe(Ni)-Ostretching vibration shifts to a high frequency about 20 cm^-1with a structure transformation. Fe ions are all in high spin state of +3 valence and Ni ions incorporated in lattice are in +3 valence.

Key words: LaFe_1-xNi_xO₃, Structure transformation, ⁵⁷Fe Mö, ssbauer spectrum