Abstract: A series of solid soItition Pr_2-χSr_χNiO₄(0.00≤χ≤1. 00) were synthesized with the nickel valence being +2 to +3.The mixed oxides crystallized in orthorhombic(0.00≤χ<0.10 and x=1.00) or tetragonal system(0.10≤χ<1.00). The crystal parameter ratio c/a shows a maximum at χ = 0.5 caused by Jahn-Teller distortion in octahedral site of the low-spin Ni³⁺ ions. The magnetic susceptibilities of the mixed oxides follow the Curie-Weiss rule at temperatures 77～250K. An antiferomagne exchange interaction was observed in all the samples.The change of electrical properties in the system of χ>0.5 is attributed to the change of electronic configuration of Ni³⁺ from t_2δ⁶d_Z¹2 to t_2δ⁶d_Z¹2-y².

Key words: praseodium-strontium-nickel mixed oxide, crystal structure, electrical property, magnetic property