XANES测定玻璃中铬的氧化态：与光学吸收光谱法的比较
XANES determination of chromium oxidation states in glasses: comparison with optical absorption spectroscopy
摘要：
采用X射线吸收近边结构（XANES）和光学吸收光谱研究了在空气气氛中熔制的玻璃中铬的氧化态。在两种方法之间获得了Cr（III）和Cr（VI）的相对比例的良好一致性。我们表明，Cr（III）的吸收系数的化学依赖性是不太重要的XANES比在光学吸收光谱。在不同条件下熔化的玻璃的比较提供了一个间接评估的摩尔消光系数的Cr（VI）的玻璃。
英文摘要：
The oxidation state of chromium in glasses melted in an air atmosphere with and without refining agents was investigated by Cr K-edge X-ray Absorption Near-Edge Structure (XANES) and optical absorption spectroscopy. A good agreement in the relative proportion of Cr(III) and Cr(VI) is obtained between both methods. We show that the chemical dependence of the absorption coefficient of Cr(III) is less important in XANES than in optical absorption spectroscopy. The comparison of glasses melted under different conditions provides an indirect assessment of the molar extinction coefficient of Cr(VI) in glasses.
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