Investigation of Fe+3 and Fe+2 properties in calcium aluminoborate glasses

被引：0
|
作者：
H.B. Pascoal
W.M. Pontuschka
H. Rechenberg
机构：
[1] Instituto de Física da Universidade de São Paulo,
[2] Dept. de Física Geral - Caixa Postal 66318,undefined
[3] CEP 05315-900,undefined
[4] São Paulo,undefined
[5] SP,undefined
[6] Brazil,undefined
来源：
Applied Physics A | 2000年 / 70卷
关键词：
PACS: 71.23.Cq; 76.30.Fe;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Ferric and ferrous ions were investigated by employing 57Fe Mössbauer, Raman spectroscopy, and EPR to xCaO:(80-x)B2O3:20Al2O3+yFe2O3 glasses providing information about their relative concentrations and local structural properties of the glass matrix as a function of the CaO concentration. The concentration of [Fe+3] increases almost linearly in the analyzed composition range. The quadrupole splitting and isomer shift values for Fe+2 and Fe+3 ions show a dependence on x. The results are discussed with regard to the changes of the relative concentrations of BO3 and BO4 groups and of non-bridging oxygens (NBOs), as inferred by the spectral analysis.
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页码：211 / 214
页数：3
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