Abstract
Mössbauer studies of ceramic samples of the antiferromagnetic perovskite PbFe2/3W1/3O3 have been carried out. It has been established that the temperature of transition to the magnetically ordered state is T N = 365 K. Iron ions in PbFe2/3W1/3O3 are found to reside in the high-spin Fe3+ state. The Fe3+ ions occupy inequivalent positions differing in the nearest cation environment, or more precisely, tungsten and iron ions are distributed in a random manner over the sites of the octahedral sublattice. The inequivalent positions arise as a result of the Fe and W ions being statistically distributed over the octahedral sublattice. For T > 0 K, magnetic fields at the nuclei and, hence, the average thermodynamic values of the magnetic moments of Fe3+ ions occupying inequivalent positions are different and, at a given temperature, are determined by the number of the nearest magnetic neighbors, with the effective magnetic fields (H eff) varying differently with temperature. As the temperature is lowered, the fields H eff level off gradually in response to the effective magnetic fields of iron ions having different numbers of exchange bonds leveling off with decreasing temperature which lowers thermal excitation.
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Original Russian Text © A.S. Kamzin, V.A. Bokov, 2013, published in Fizika Tverdogo Tela, 2013, Vol. 55, No. 6, pp. 1103–1109.
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Kamzin, A.S., Bokov, V.A. Mössbauer studies of PbFe2/3W1/3O3 multiferroics. Phys. Solid State 55, 1191–1197 (2013). https://doi.org/10.1134/S1063783413060140
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DOI: https://doi.org/10.1134/S1063783413060140