Abstract
0.5BiFeO3-0.5Pb1-xSrxTiO3 (0 ≤ x ≤ 1) solid solution compositions were synthesized using solid phase reactions route from high-purity oxides. Mössbauer studies showed that for 0.5BiFeO3-0.5PbTiO3 (x = 0) the magnetic phase transition temperature T M value was about 130 K. Substitution of Sr for Pb led to a dramatic decrease in T M, though the Fe content did not change with x and for 0.5BiFeO3-0.5SrTiO3 (x = 1) T M was only ≈20 K. This dramatic difference in T M values seems to be due to additional contribution of the magnetic superexchange between Fe3+ ions via the empty 6p states of Bi3+ and Pb2+ ions to the overall superexchange.
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