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Thermodynamic Properties of TeO_2-ZnO Glasses in the Range 0-650 K

机译:TeO_2-ZnO玻璃在0-650 K范围内的热力学性质

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摘要

The heat capacity C_p~0 of (TeO_2)_n(ZnO)_(1-n) (n = 0.65, 0.70, 0.80) tellurite glasses has been determined by precision adiabatic (6-350 K) and dynamic scanning (320-650 K) calorimetry. The thermodynamic characteristics of their devitrification and glassy state have been determined. The experimental data have been used to calculate the standard thermodynamic functions of samples in the glassy and "supercooled liquid" states (0-650 K): heat capacity C_p~0 (T), enthalpy H~0(T) - H~0(0), entropy S~0(T) - S~0(0), and Gibbs function G~0(T) - H~0(0). Multifractal processing of the low-temperature heat capacity data has been used to assess the character of structural heterodynamicity of the tellurite glasses. The heat capacity of the glasses has been analyzed in comparison with that of their constituent oxides. The composition dependences of the glass transition temperature, crystallization onset temperature, and thermodynamic functions at 298.15 and 600 K have been obtained.
机译:(TeO_2)_n(ZnO)_(1-n)(n = 0.65,0.70,0.80)碲酸盐玻璃的热容C_p〜0已通过精密绝热(6-350 K)和动态扫描(320-650)确定K)量热法。已经确定了它们的失透和玻璃态的热力学特征。实验数据已用于计算玻璃态和“过冷液体”状态(0-650 K)下样品的标准热力学函数:热容C_p〜0(T),焓H〜0(T)-H〜0 (0),熵S〜0(T)-S〜0(0)和吉布斯函数G〜0(T)-H〜0(0)。低温热容数据的多重分形处理已用于评估碲酸盐玻璃结构异质性的特征。已将玻璃的热容量与其组成氧化物的热容量进行了比较。已经获得了玻璃化转变温度,结晶起始温度以及在298.15和600 K时的热力学函数的成分依赖性。

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