New glassy matrices, able to incorporate new highly concentrated radioactive liquid wastes (HLW), are being studied. Investigations were performed on rare earth-rich glasses, known as very durable matrices. The selected basic glass composition was (wt. %): 51.0 SiCh- 8.5 B_2O_3-12.2 Na+2O - 4.3 Al_2O_3 - 4.8 CaO - 3.2 ZrO_2 - 16.0 Nd_2O_3. To determine both the environment around the rare earth in this glass and its evolution according to its concentration (1.3 - 30 wt. % Nd2Ch), EXAFS (Extended X-Ray Absorption Fine Structure) spectroscopy at the Lm-edge of neodymium and optical absorption spectroscopy were used. By coupling these two characterisation methods, several hypotheses are proposed about the nature of the rare earth neighbouring in the glass.
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机译：正在研究新的玻璃矩阵，能够纳入新的高度浓度放射性液体废物（HLW）。对稀土丰富的眼镜进行调查，称为非常耐用的矩阵。所选的碱性玻璃组合物（重量％）：51.0 sich-8.5 B_2O_3-12.2 Na + 2O-4.3 Al_2O_3 - 4.8 CaO - 3.2 ZrO_2 - 16.0 ND_2O_3。根据其浓度（1.3-30重量％ND2CH），在钕和光学吸收的浓度（1.3-30重量％ND2CH）中，根据其浓度（1.3-30重量％的ND2CH），EXAFS（延长X射线吸收细结构）光谱和光学吸收，确定稀土周围的环境及其进化使用光谱学。通过耦合这两种表征方法，提出了几个假设关于玻璃中邻近邻近的稀土性质的本质。
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