Soft X-Ray Absorption Spectroscopy as a Method to Study Y1-y Ca y BaCo4-x M x O7 Cobaltites (M = Fe, Zn)

被引：5
|
作者：
Galakhov, V. R. [1 ,2 ]
Shamin, S. N. [1 ]
Mesilov, V. V. [1 ]
机构：
[1] Russian Acad Sci, Ural Branch, Mikheev Inst Met Phys, Ekaterinburg 620137, Russia
[2] Ural Fed Univ, Ekaterinburg 620002, Russia
来源：
JETP LETTERS | 2018年 / 107卷 / 09期
基金：
俄罗斯基础研究基金会;
关键词：
SOLID-SOLUTIONS; IRON IONS; STATES;
D O I：
10.1134/S0021364018090072
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Soft X-ray absorption spectroscopy has been used to determine the charge state and content of cobalt ions in doped cobaltites CaBaCo4O7, Y0.5Ca0.5BaCo4O7, Y0.5Ca0.5BaCo4-x Fe (x) O-7, and Y0.5Ca0.5BaCo4-zZnzO7. A method has been proposed to determine the relative concentrations of cobalt ions in barium-containing cobaltites from the relative intensities of X-ray absorption D<inverted exclamation>D 3/4 L (3)/Ba M (5) spectra, and the relative contents of both Fe and Zn doping elements and Co2+ and Co3+ ions have been determined. It has been found that the substitution of iron ions for some cobalt ions (cobaltite Y0.5Ca0.5BaCo4-x Fe (x) O-7) transforms some Co3+ ions to Co2+ ions. It has been found that iron ions are in the 3+ charge state and have tetrahedral coordination with oxygen ions. The substitution of divalent zinc ions for some cobalt ions (cobaltite Y0.5Ca0.5BaCo4-z Zn (z) O-7) increases the concentration of high-spin Co3+ ions. The tetrahedral coordination of the Co2+ and Co3+ ions has been confirmed.
引用
收藏
页码：583 / 587
页数：5
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