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首页> 外文期刊>Physica, B. Condensed Matter >Structure of Na _2O·MO·SiO _2· CaF _2 (M=Mg, Ca) oxyfluoride glasses (Conference Paper)
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Structure of Na _2O·MO·SiO _2· CaF _2 (M=Mg, Ca) oxyfluoride glasses (Conference Paper)

机译：Na _2O·MO·SiO _2·CaF _2（M = Mg，Ca）氟氧化物玻璃的结构（会议论文）

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摘要

(9-x)CaO·xMgO·15Na _2O·60SiO _2·16CaF _2(x=0, 2, 4, 6, and 9) oxyfluoride glasses were prepared. Utilizing the Raman scattering technique together with ~(29)Si and ~(19)F MAS NMR, the effect of alkaline metal oxides on the Q species of glass was characterized. Raman results show that as magnesia is added at the expense of calcium oxide, the disproportional reaction Q ~3→Q ~4Q ~2 (Q ~n is a SiO _4 tetrahedron with n bridging oxygens) prompted due to the high ionic field strength of magnesia, magnesium oxide entered into the silicate network as tetrahedral MgO _4, and removed other modifying ions for charge compensation. This reaction was confirmed by ~(29)Si MAS NMR. ~(19)F MAS NMR results show that fluorine exists in the form of mixed calcium sodium fluoride species in all glasses and no Si-F bonds were formed. As CaO is gradually replaced by MgO (x=6, 9), a proportion of the magnesium ions combines with fluorine to form the MgF species. Meanwhile, some part of Na ions complex F ~- in the form of F-Na(6).
机译：制备（9-x）CaO·xMgO·15Na _2O·60SiO _2·16CaF _2（x = 0、2、4、6和9）氟氧化物玻璃。利用拉曼散射技术，结合〜（29）Si和〜（19）F MAS NMR，表征了碱金属氧化物对玻璃Q物种的影响。拉曼结果表明，以氧化钙为代价添加氧化镁时，由于离子束的高离子场强度，促使了Q〜3→Q〜4Q〜2（Q〜n是具有n个桥连氧的SiO _4四面体）的歧化反应。在氧化镁中，氧化镁以四面体MgO _4的形式进入硅酸盐网络，并去除了其他修饰离子以进行电荷补偿。该反应通过〜（29）Si MAS NMR确认。 〜（19）F MAS NMR结果表明，氟在所有玻璃中均以混合的氟化钙钠形式存在，并且未形成Si-F键。随着CaO逐渐被MgO替代（x = 6、9），一定比例的镁离子与氟结合形成MgF物质。同时，Na离子的某些部分以F-Na（6）的形式与F〜-形成络合物。

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