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首页> 外文期刊>Physica, B. Condensed Matter >In3+ substitution effects and defect distribution in Li0.25Mg0.5Mn0.1Fe2.15-xInxO4 studied by positron annihilation and Mossbauer spectroscopy
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In3+ substitution effects and defect distribution in Li0.25Mg0.5Mn0.1Fe2.15-xInxO4 studied by positron annihilation and Mossbauer spectroscopy

机译：用正电子an没和Mossbauer光谱研究Li0.25Mg0.5Mn0.1Fe2.15-xInxO4中In3 +的置换效应和缺陷分布

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摘要

The ferrite series Li0.25Mg0.5Mn0.1Fe2.15-xInxO4 (x = 0, 0.3, 0.6, 0.9) have been studied through positron lifetime and Mossbauer spectroscopic techniques. The changes in positron lifetime parameters are attributed to positron trapping in tetrahedral and octahedral sites at the different stages of In3+ ion substitution. Positrons initially get trapped in the vacancies in the octahedral sites in the undoped sample. With doping by In3+ ions up to x = 0.3, tetrahedral vacancies dominate as positron trapping sites. With further doping, some of the octahedral sites become vacancies and trap positrons. Incorporation of In3+ ions in the place of Fe3+ ions in the series has also introduced magnetic dilution in both the tetrahedral (A) and octahedral (B) sites. Knowledge of the variation in the magnetic properties of these ferrites with increase in concentration of In3+ ions, as derived from the Mossbauer parameters, suggests a correlation of such a variation with the defect concentration in these samples. (C) 2004 Elsevier B.V. All rights reserved.
机译：通过正电子寿命和Mossbauer光谱技术研究了铁氧体系列Li0.25Mg0.5Mn0.1Fe2.15-xInxO4（x = 0、0.3、0.6、0.9）。正电子寿命参数的变化归因于正离子捕获在In3 +离子取代不同阶段的四面体和八面体位点。正电子最初被困在未掺杂样品的八面体位点的空位中。当In3 +离子的掺杂量高达x = 0.3时，四面体空位起着正电子俘获位点的作用。随着进一步的掺杂，一些八面体位点成为空位并俘获正电子。在该系列中掺入In3 +离子代替Fe3 +离子还在四面体（A）和八面体（B）位置引入了磁稀释。从Mossbauer参数推导，随着In3 +离子浓度的增加，这些铁氧体的磁性能变化的知识表明，这种变化与这些样品中的缺陷浓度相关。 （C）2004 Elsevier B.V.保留所有权利。

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