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首页> 外文期刊>Journal of Applied Physics >Ionic Valences in Manganese‐Iron Spinels
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Ionic Valences in Manganese‐Iron Spinels

机译：锰铁尖晶石中的离子价

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摘要

Because both manganese and iron assume multiple valences in oxide structures, it is possible to fabricate spinels over a continuous range of composition from Mn3O4 to Fe3O4. Magnetic‐moment data for samples fabricated within this range are reported and an interpretation of the data in terms of the distribution of ions of manganese and iron is presented. The data agree with previous indications that manganese ferrite, MnFe2O4, is an almost completely normal spinel with Mn2+ on A sites and Fe3+ on B sites. In addition, the usual assumption that excess iron replaces manganese as Fe2+ on B sites is substantiated. However, the data are not compatible with the previously held assumption that Fe3+ is replaced by excess manganese as Mn3+. Instead, the variation of magnetic moments and Curie temperatures with composition is interpreted in terms of a model in which excess manganese replaces Fe3+ as Mn4+ and an equal amount of iron is converted to Fe2+. When the manganese content gets so high that all the iron is Fe2+ (Mn2FeO4), manganese then replaces the iron as Mn3+ and reconverts an equal amount of Mn4+ to Mn3+, and the Mn3+, because of its tetragonal nature, introduces spinel twinning. It is proposed that the Mn4+Fe2+ pair in octahedral coordination is stabilized with respect to a Mn3+Fe3+ pair because of the interaction of the manganese orbitals with the 2p orbitals of the surrounding oxygen anions.
机译：由于锰和铁在氧化物结构中均具有多个化合价，因此可以在从Mn3O4到Fe3O4的连续组成范围内制造尖晶石。报告了在此范围内制造的样品的磁矩数据，并给出了有关锰和铁离子分布的数据解释。数据与以前的迹象相符，锰铁氧体MnFe2O4是几乎完全正常的尖晶石，A位为Mn2 +，B位为Fe3 +。另外，通常的假设是，过量的铁替代了B位上的Fe2 +代替了锰。但是，该数据与先前持有的假设-即Fe3 +被过量的锰替代为Mn3 +的假设不相容。取而代之的是，磁矩和居里温度随组成的变化是根据一种模型来解释的，在模型中，过量的锰替代了Fe3 +作为Mn4 +，而等量的铁转化为Fe2 +。当锰含量过高以至于所有铁都是Fe2 +（Mn2FeO4）时，锰将铁替代为Mn3 +，并将等量的Mn4 +转化为Mn3 +，而Mn3 +由于其四方性而引入了尖晶石孪晶。提出由于锰轨道与周围氧阴离子的2p轨道的相互作用，八面体配位的Mn4 +Fe2+对相对于Mn3 +Fe3+对是稳定的。

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  • 来源
    《Journal of Applied Physics》 |1958年第3期|共3页
  • 作者

    Eschenfelder Andrew H.;

  • 作者单位

    International Business Machines Corporation, Research Center, Poughkeepsie, New York;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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