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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 >Q speciation in alkali germanate glasses
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Q speciation in alkali germanate glasses

机译：碱式锗酸盐玻璃中的Q形态

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摘要

We have curve fit a series of alkali germanate glasses (R _2O-GeO_2, R = Na, K, Rb and Cs). Fits of the high-frequency (700-1100 cm~(- 1)) region of the Raman spectra indicate that NBO vibrations are present, albeit very weak, in all compositions, including those below the germanate anomaly maxima. In addition Q~2 species appear to be in greater abundance than Q~3 in this composition range. Above anomaly compositions, the dominant Q species is Q~3 followed by Q ~2 species being observed at 35-40 mol% alkali oxide. The Q ~3/Q~2 intensity ratio is alkali dependent; the larger alkalis have fewer Q~2 species present. A band at ～ 746 cm ~(- 1) is indicative of a higher coordinated Ge species. It occurs at ～ 10 mol% alkali and is observed at low intensity in the highest alkali-containing glasses. For the Na_2O-GeO_2 glasses its intensity reaches a maximum at 20 mol% Na_2O. Similar maxima are observed in Rb_2O- and Cs_2O-containing glasses also at the 20 mol% maximum. K_2O-containing glasses have a maximum at 15 mol% alkali. The intensity of the band is alkali dependent suggesting that the concentration of higher coordinated Ge species decreases in the sequence Rb _2O ? Cs_2O < K_2O < Na_2O, consistent with recent neutron and X-ray diffraction studies.
机译：我们对一系列碱金属锗酸盐玻璃（R _2O-GeO_2，R = Na，K，Rb和Cs）进行曲线拟合。拉曼光谱的高频区域（700-1100 cm〜（-1））的拟合表明，在所有成分中（包括低于日耳曼异常最大值的成分），都存在NBO振动，尽管非常弱。此外，在此组成范围内，Q〜2物种的丰度比Q〜3高。在异常成分以上，主要的Q种类是Q〜3，随后在35-40 mol％的碱金属氧化物中观察到Q〜2种类。 Q〜3 / Q〜2强度比与碱有关;较大的碱具有较少的Q〜2种类。 〜746 cm〜（-1）处的能带表示较高配位的Ge物种。它在〜10 mol％的碱中发生，并且在含碱量最高的玻璃中以低强度观察到。对于Na_2O-GeO_2玻璃，其强度在20 mol％Na_2O处达到最大值。在含Rb_2O和Cs_2O的玻璃中也观察到相似的最大值，最大值也为20 mol％。含K_2O的玻璃具有最大15摩尔％的碱。该带的强度是碱依赖性的，这表明较高配位的Ge物质的浓度以Rb_2O≤Rb_2的顺序降低。 Cs_2O

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