COVALENCY EFFECTS AND THE PRESSURE DEPENDENCE OF THE MOESSBAUER LINE SHIFTS FOR SPINEL-TYPE FERRITES.

被引：0

作者：

Nikolaev, V.I. ^{[1
]}

Rusakov, V.S. ^{[1
]}

Chistyakova, N.I. ^{[1
]}

机构：

[1] Moscow State Univ, General Physics, Dep, Moscow, USSR, Moscow State Univ, General Physics Dep, Moscow, USSR

来源：

Physica Status Solidi (A) Applied Research | 1985年 / 91卷 / 02期

关键词：

CRYSTALS; -; Structure; SPECTROSCOPY; MOSSBAUER; Applications;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

In our previous papers we paid attention to the essential role of the oxygen parameter u in the Moessbauer spectroscopy of ferrites with spinel structure. The analysis of the type of the interconnection between the Mossbauer line shifts for Fe**3** plus nuclei in the tetrahedral and octahedral positions and the lattice parameter a within the limits of the molecular orbital method shows that one of the main factors of this complex interconnection is the difference between the values of u for spinel-type ferrites. If we take into account that the external pressure p can lead in fact not only to variation of the lattice parameter a but to a change of the oxygen parameter u as well, then one can get an expression for the change of the shift part connected with covalency effects. This expression is presented and discussed in the note.

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