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Mössbauer study of the effect of mechanical activation on the magnetic properties of PbFeNbO

Springer Proceedings in Physics, ISSN: 1867-4941, Vol: 193, Page: 155-165
2017
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Conference Paper Description

Mössbauer studies of PbFeNbO samples prepared by mechanical activation of PbO, FeO and NbO mixture and subsequent sintering at various temperatures T were performed. The room temperature Mössbauer spectra consist of two doublets (D1 and D2) for the samples with T < 800 °C and one doublet (D1) for the samples with T > 800 °C. The parameters of the doublet D1 correspond to Fe in the octahedron environment. Doublet D2 has a lower isomer shift corresponding to Fe with the coordination number 5 that indicates the presence of oxygen vacancies. Dependence of the temperature T of magnetic phase transition on T has a maximum at T ≈ 700 °C. The effect of Fe/Nb ordering degree and oxygen deficiency on T is discussed.

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