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首页> 外文期刊>European Journal of Glass Science and Technology, PartB. Physics and Chemistry of Glasses >Role of Al formers and Na modifiers in Al_2O_3-SiO_2-Na_2O-MgO-Eu_2O_3 glasses: Brillouin and Raman spectroscopy studies
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Role of Al formers and Na modifiers in Al_2O_3-SiO_2-Na_2O-MgO-Eu_2O_3 glasses: Brillouin and Raman spectroscopy studies

机译：铝形成剂和钠改性剂在Al_2O_3-SiO_2-Na_2O-MgO-Eu_2O_3玻璃中的作用：布里渊和拉曼光谱研究

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摘要

Brillouin and Raman spectroscopies were used to investigate the structure of xAl_2O_3 centre dot (72.08-x)SiO_2 centre dot 14.81 Na_2O centre dot 11.85 MgO centre dot 1.26Eu_2O_3 (x=0, 2.96, 5.92, 8.88, 14.81 mol percent) and yNa_2O centre dot (83.93-y)SiO_2 centre dot 2.96Al_2O_3 centre dot 11.85MgO centre dot 1.26Eu_2O_3 (y=9.86,14.81,19.73, 24.67 mol percent) glasses. The depolyrnerisation (polymerisation) of the En~(3+) doped soda magnesia aluminosilicate (EDSMAS) glass is mainly characterised by the presence of nonbridging (bridging) oxygens and three (four) member silicate and aluminosilicate rings. The aluminium formers entering the glass recover Si-O-Si bridges by attracting charge balancing modifiers from depolymerised SiO_4 network. In this way the (Si,Al)_4 rather than (Si,Al)_3 membered rings are formed, i.e. the overall structure becomes more polymerised rather than fragmented. This is supported by the glass elastic constants and moduli as measured by Brillouin spectroscopy. Concurrent increasing polarisability deduced from the enhanced Poissor's ratio is mostly due to the appearance of AlO_4 tetrahedral groups weakly bound to sodium ions. The sodium modifier ions substituting for silicon atoms depolymerise the glass causing the formation of distinct Q~3 and Q~2 species and the rapid increase in the number of three member rings. However, the overall glass structure becomes less compressible in the volumetric sense.
机译：用布里渊光谱和拉曼光谱研究xAl_2O_3中心点（72.08-x）SiO_2中心点14.81 Na_2O中心点11.85 MgO中心点1.26Eu_2O_3（x = 0，2.96，5.92，8.88，14.81 mol％）和yNa_2O中心的结构（83.93-y）SiO_2中心点2.96Al_2O_3中心点11.85MgO中心点1.26Eu_2O_3（y = 9.86,14.81,19.73，24.67 mol％）玻璃。 En〜（3+）掺杂苏打氧化镁铝硅酸盐（EDSMAS）玻璃的去聚化（聚合）主要特征在于存在非桥联（桥连）氧和三个（四个）成员硅酸盐和铝硅酸盐环。进入玻璃的铝形成剂通过从解聚的SiO_4网络中吸引电荷平衡改性剂来恢复Si-O-Si桥。以这种方式形成（Si，Al）_4而不是（Si，Al）_3元环，即，整个结构变得更加聚合而不是断裂。这由布里渊光谱法测量的玻璃弹性常数和模量来支持。由增加的泊松比得出的极化率的同时增加主要是由于出现了弱结合钠离子的AlO_4四面体基团。取代硅原子的钠改性剂离子使玻璃解聚，从而导致形成独特的Q〜3和Q〜2物种，并迅速增加了三元环的数量。但是，整个玻璃结构在体积上变得不可压缩。

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