Abstract—

The Mössbauer spectra of PbFe_0.5Ta_0.5O₃ samples prepared by mechanical activation of a mixture of PbO, Fe₂O₃, and Ta₂O₅ with subsequent annealing at different temperatures T_a have been investigated. The Mössbauer study showed that Fe³⁺ 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_0.5Ta_0.5O₃ samples are discussed.

中文翻译：

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Mössbauer研究机械活化对PbFe 0.5 Ta 0.5 O 3磁性的影响

摘要-

PbFe的穆斯堡尔谱_0.5的Ta _0.5 ø ₃样品制备的PbO的混合物的机械活化，铁₂ ö ₃，和Ta ₂ ö ₅与随后的退火在不同温度下Ť_一个进行了研究。Mössbauer研究表明，这些样品中的Fe ³⁺离子可以处于八面体配位形式，也可以处于配位数等于5的状态，这表明样品中存在氧空位。发现所有样品的磁相转变温度T _M。的依赖性Ť_中号上Ť_一个是峰值的附近Ť_一个≈700℃。讨论了影响机械活化的PbFe _0.5 Ta _0.5 O ₃样品的T _M值的因素。