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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Properties and structure of vitrified iron phosphate nuclear wasteforms
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Properties and structure of vitrified iron phosphate nuclear wasteforms

机译：玻璃化磷酸铁核废料的性质和结构

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The structure of vitreous iron phosphates containing up to 35 wt% of one or more common nuclear waste components such as Na2O Cs2O, SrO, UO2 or Bi2O3 have been investigated using Fe-57 Mossbauer, X-ray absorption, X-ray photoelectron and Raman spectroscopies and high energy X-ray and neutron diffraction techniques. The glass samples investigated were prepared by melting appropriate chemicals in air at approximately 1200 degrees C for 2 h in alumina crucibles. The chemical durability of the glasses was investigated by measuring their dissolution rates in distilled water st 90 degrees C using the product consistency test (PCT) methodology. The chemical durability of these glasses is characterized by dissolution rates of 10-(10)-10-(11) g/cm(2)/min. The Mossbauer spectra indicate the presence of both Fe(II) and Fe(III). However, the maximum Fe(II) fraction, Fe(II)/[Fe(II)+ Fe(III)]. was 0.34. X-ray absorption data show that, on average, both species of iron ions are coordinated with approximately 5 near neighbor oxygens and that the iron-oxygen coordination is only slightly (<10%) influenced by the type or the concentration of the waste elements. Iron ions are also coordinated with 4-6 phosphorous ions in the second shell. Only a minority of the oxygen ions, about 22%, take part in bridging -P-O-P- bonds. Raman spectra show that the phosphorous-oxygen network, which is dominated by (P2O7)(4-) dimer units, in different samples are similar. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 19]
机译：使用Fe-57 Mossbauer，X射线吸收，X射线光电子和拉曼光谱技术研究了含磷酸铝铁盐的结构，该粉状磷酸铁的含量高达35 wt％，其中一种或多种常见核废料成分为N​​a2O Cs2O，SrO，UO2或Bi2O3。光谱学和高能X射线和中子衍射技术。通过在氧化铝坩埚中在约1200摄氏度的空气中将适当的化学物质熔化2小时来制备所研究的玻璃样品。通过使用产品一致性测试（PCT）方法测量玻璃在90°C蒸馏水中的溶解速率来研究玻璃的化学耐久性。这些玻璃的化学耐久性以10-（10）-10-（11）g / cm（2）/ min的溶解速率为特征。 Mossbauer光谱表明同时存在Fe（II）和Fe（III）。但是，最大Fe（II）分数Fe（II）/ [Fe（II）+ Fe（III）]。是0.34。 X射线吸收数据表明，平均而言，两种铁离子均与大约5个邻近的氧配位，并且铁-氧配位仅受废物元素类型或浓度的轻微影响（<10％） 。第二壳中的铁离子也与4-6个磷离子配位。只有少数氧离子（约22％）参与桥接-P-O-P-键。拉曼光谱表明，在不同样品中以（P2O7）（4-）二聚体单元为主的磷氧网络是相似的。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：19]

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