Mössbauer Study of the Mechanical Activation Effect on the Magnetic Properties of PbFe0.5Ta0.5O3

• Published in: Crystallography reports 2020-05, Vol.65 (3), p.343-346
• Main Authors: Kubrin, S. P., Raevski, I. P., Gusev, A. A., Isupov, V. P., Chou, C.-C., Titov, V. V., Sarychev, D. A., Raevskaya, S. I., Zekhtser, M. Y., Malitskaya, M. A.
• Format: Article
• Language: English
• Subjects: Activation; Coordination numbers; Crystallography and Scattering Methods; Magnetic properties; Phase transitions; Physics; Physics and Astronomy; Proceedings of the XV International Conference “Mössbauer Spectroscopy and Its Applications”; Tantalum; Tantalum oxides
• ISSN: 1063-7745; 1562-689X
• DOI: 10.1134/S1063774520030177

— The Mössbauer spectra of PbFe 0.5 Ta 0.5 O 3 samples prepared by mechanical activation of a mixture of PbO, Fe 2 O 3 , and Ta 2 O 5 with subsequent annealing at different temperatures T a have been investigated. The Mössbauer study showed that Fe 3+ ions in these samples can be either in the octahedral coordination or in the state with a coordination number equal to 5, which indicates the presence of oxygen vacancies in the samples. The magnetic-phase transition temperatures T M are found for all samples. The dependence of T M on T a is peaking in the vicinity of T a ≈ 700°C. The factors affecting the T M values of the mechanically activated PbFe 0.5 Ta 0.5 O 3 samples are discussed.