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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 >In-situ high temperature Raman and Brillouin light scattering studies of sodium silicate glasses
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In-situ high temperature Raman and Brillouin light scattering studies of sodium silicate glasses

机译：硅酸钠玻璃的原位高温拉曼和布里渊光散射研究

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摘要

In-situ Raman and Brillouin light scattering experiments were carried out to study the structure and elastic properties of sodium silicate glasses xNa_2O-(100 - x)SiO_2 (x = 0, 8, 10, 15, 20, 25, 30, and 40 mol%) from room temperature up to the respective glass transition temperature for each composition. Temperature independent shear modulus and Young's modulus were observed in 15Na_2O-85SiO_2 glass up to 400 °C, while the temperature independent bulk modulus occurred in glass with 15 to 20 mol% Na~2O in the same temperature range. A simple correlation was established between the Raman spectrum of a sodium silicate glass at room temperature and the evolution of its elastic properties with increasing temperature. The silica network stiffens upon heating up due to the conformation change from α-like to β-like rings in silica-rich sodium silicate glasses, characterized by the main band at ～ 440 cm- 1 in Raman spectra. When the 950 cm- 1 band associated with the Q2 species becomes obvious after substantial amount of Na~2O was added into the glass matrix, glasses behave like normal solids (softening upon heating up). If neither the main band at ～ 440 cm- 1 nor the 950 cm - 1 band is well defined, intermediate glasses emerge, whose elastic moduli do not change with temperature because the stiffening and softening effects become comparable.
机译：进行了拉曼和布里渊原位光散射实验，研究了硅酸钠玻璃xNa_2O-（100-x）SiO_2（x = 0、8、10、15、20、25、30和40的结构和弹性性能对于每种组合物，从室温到各自的玻璃化转变温度为1mol％。在温度高达400°C的15Na_2O-85SiO_2玻璃中观察到温度独立的剪切模量和杨氏模量，而在相同温度范围内，Na〜2O含量为15〜20 mol％的玻璃中出现了温度独立的体积模量。在室温下硅酸钠玻璃的拉曼光谱与其随温度升高的弹性变化之间建立了简单的关系。由于富含二氧化硅的硅酸钠玻璃中的构象从α状环变为β状环，二氧化硅网络在加热时会变硬，其特征在于拉曼光谱的主带在440 cm-1处。当在玻璃基体中添加大量的Na〜2O后，与Q2物种相关的950 cm-1谱带变得明显时，玻璃的行为就像普通固体一样（加热时变软）。如果在〜440 cm-1处的主带和在950 cm-1处的主带都没有很好地定义，则会出现中间玻璃，其弹性模量不会随温度而变化，因为硬化和软化效果变得可比。

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