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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 >Manifestation of thermodynamic glass transition by structure and picosecond dynamics in alkali tellurite glasses
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Manifestation of thermodynamic glass transition by structure and picosecond dynamics in alkali tellurite glasses

机译：碱金属碲酸盐玻璃的结构和皮秒动力学表现出热力学玻璃化转变

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摘要

The Raman spectra of the 0.1Cs _2O-0.9TeO _2 melt were measured and analyzed over a broad temperature range including the glassy, supercooled and molten state in an effort to follow the varying structural and dynamical aspects caused by temperature and alkali modifier. The network structure of the glass/melt is formed by mixing TeO _4 trigonal bipyramid and TeO _3 trigonal pyramid units. Changing alkali content and/or temperature results to conversion of the TeO _4 units to TeO _3 units with a varying number of non-bridging oxygen atoms. The low-frequency Raman spectra reveal a well-resolved Boson peak whose frequency also depends on temperature. The variation of the maximum of the Boson peak has been determined and discussed in the framework of current phenomenological models. The short-time dynamics of the system experiences drastic changes when approaching the glass-to-liquid transition. The temperature dependent plot of the correlation times extrapolates to a crossover value, which we assign as spectral evidence of the system's known thermodynamic glass transition temperature. Similar behavior exhibit several spectral features, such as the maximum of the Boson peak, the exponent of the susceptibility and the intensity ratio related to the structural transformation from TeO _4 tbp to TeO _3 tp species occurring in the medium range order structure.
机译：在包括玻璃态，过冷态和熔融态在内的较宽温度范围内，对0.1Cs _2O-0.9TeO _2熔体的拉曼光谱进行了测量和分析，以适应温度和碱改性剂引起的结构和动力学方面的变化。玻璃/熔体的网络结构是通过将TeO_4三角双锥体和TeO_3三角锥体单元混合而形成的。碱含量和/或温度的变化导致TeO _4单元转化为具有不同数目的非桥连氧原子的TeO _3单元。低频拉曼光谱显示解析度很高的玻色子峰，其频率也取决于温度。玻色子峰的最大值的变化已在当前现象学模型的框架内确定并讨论。当接近玻璃到液体的转变时，系统的短时动力会发生巨大变化。相关时间的温度相关图可外推至交叉值，我们将其指定为系统已知热力学玻璃化转变温度的光谱证据。相似的行为表现出几个光谱特征，例如玻色子峰的最大值，磁化率指数和与从TeO _4 tbp到TeO _3 tp物种的结构转变有关的强度比，其发生在中等范围的结构中。

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