Mössbauer isomer shifts, hyperfine interactions, and magnetic hyperfine anomalies in compounds of iridium
Mössbauer isomer shifts, hyperfine interactions, and magnetic hyperfine anomalies in compounds of iridium
复制标题
铱化合物中的穆斯堡尔异构体位移、超精细相互作用和磁超精细异常
DOI：
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发表时间：
1970
期刊：
影响因子：
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通讯作者：
U. Zahn
中科院分区：
文献类型：
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作者：
F. Wagner;U. Zahn
本文研究了几种三价和四价Ir化合物以及IrF5和IrF6中~(193)Ir的73keVγ-射线的异构体位移与氧化态的关系。观察到的位移可以归因于不同数量的5d电子的屏蔽效应，但也可能有来自σ键电子的额外的直接贡献。在具有Kramers简并电子基态的六卤素配合物中，发现并研究了在0.5K至4.2K温度下IrF6与四价[IrCl6]2−和[IrBr6]2−配合物之间的磁性有序相，观察到高达10%的磁性超精细异常，这支持从核心极化、轨道和自旋偶极贡献的角度对超精细场的解释。
The dependence of the isomer shift of the 73 keVγ-rays of193Ir on the oxidation state was studied in a variety of compounds of trivalent and tetravalent iridium as well as in IrF5 and IrF6. The observed shifts can be attributed to the sielding effect of the varying number of 5d electrons, but there may be additional direct contributions fromσ-bonding electrons. In the hexahalogen complexes with Kramers-degenerate electronic groundstates magnetically ordered phases were found and studied at temperatures between 0.5 and 4.2 K. Between IrF6 and tetravalent [IrCl6]2− and [IrBr6]2− complexes magnetic hyperfine anomalies of up to 10% were observed, which support the presented interpretation of the hyperfine fields in terms of core polarization, orbital and spin-dipolar contributions.