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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 >Effect of boron oxide addition on the Nd~(3+) environment in a Nd-rich soda-lime aluminoborosilicate glass
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Effect of boron oxide addition on the Nd~(3+) environment in a Nd-rich soda-lime aluminoborosilicate glass

机译：氧化硼对富含钕的钠钙铝硼硅酸盐玻璃中Nd〜（3+）环境的影响

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摘要

The environment of Nd~(3+) ions has been studied using optical absorption spectroscopy and EXAFS at the Nd L_3-edge, in a series of soda lime aluminoborosilicate glasses with increasing B_2O_3 content. The proportion of BO_4 units has been determined by ~(11)B MAS NMR in an equivalent glass series with La~(3+) ions replacing the majority of Nd~(3+) ions, and complementary information has been obtained by measuring the Nd~(3+) decay fluorescence times in these latter glasses. In these glasses with low Al_2O_3 content, the R′ ratio, with R′ = [Na_2O~(exc)] / [B_2O_3] and [Na_2O~(exc)] = [Na _2O] - [Al_2O_3] - [ZrO_2], plays a key role in controlling the structural organization and crystallization resistance, in a similar way as the R ratio in the Dell and Bray model of sodium borosilicate glasses. At R′ > 0.5, the Nd~(3+) ions are located in a mixed silicate-borate environment and, by slow cooling of the melt, they tend to crystallize within a silicate apatite phase close to the Ca _2Nd_8(SiO_4)_6O_2 composition. At R′ < 0.5, the structural results are compatible with Nd~(3+) ions located in a borate-type environment (not excluding Si neighbors), and, by slow cooling of the melt, they segregate with Ca ~(2+) ions within a Si-depleted separated borosilicate phase.
机译：利用光吸收光谱法和EXAFS研究了Nd〜（3+）离子在Nd L_3-边缘的环境，研究了一系列B_2O_3含量增加的钠钙铝硼硅酸盐玻璃。通过〜（11）B MAS NMR在等效玻璃系列中用La〜（3+）离子取代了大多数Nd〜（3+）离子，确定了BO_4单元的比例，并且通过测量Nd〜（3+）在后面的玻璃中衰减荧光时间。在这些Al_2O_3含量低的玻璃中，R'的比率为R'= [Na_2O〜（exc）] / [B_2O_3]和[Na_2O〜（exc）] = [Na _2O]-[Al_2O_3]-[ZrO_2]，在控制结构组织和抗结晶性方面起着关键作用，类似于硼硅酸钠玻璃的Dell和Bray模型中的R比。在R'> 0.5时，Nd〜（3+）离子位于混合的硅酸盐-硼酸盐环境中，并且通过缓慢冷却熔体，它们倾向于在接近Ca _2Nd_8（SiO_4）_6O_2的硅酸盐磷灰石相中结晶。组成。在R'<0.5时，结构结果与位于硼酸盐型环境（不包括Si邻域）中的Nd〜（3+）离子相容，并且通过缓慢冷却熔体，它们与Ca〜（2+ ）贫硅分离硼硅酸盐相中的离子。

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