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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 >Sharp thermally reversing window in As45Te55-xIx chalcohalide glasses revealed by alternating differential scanning calorimetry and photo thermal deflection studies
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Sharp thermally reversing window in As45Te55-xIx chalcohalide glasses revealed by alternating differential scanning calorimetry and photo thermal deflection studies

机译：通过交替差示扫描量热法和光热变形研究揭示了As45Te55-xIx卤化银玻璃中的尖锐的热可逆窗口

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摘要

The composition dependence of different thermal parameters such as glass transition temperature, non-reversing enthalpy, thermal diffusivity etc., of bulk As45Te55-xIx chalcohalide glasses (3 <= x <= 10), has been evaluated using the temperature modulated Alternating Differential Scanning Calorimetry (ADSC) and Photo Thermal Deflection (PTD) studies. It is found that there is not much variation in the glass transition temperature of As45Te55-xIx glasses, even though there is a wide variation in the average coordination number (T). This observation has been understood on the basis that the variation in glass transition temperature of network glasses is dictated by the variation in average bond energy rather than T Further, it is found that both the non-reversing enthalpy (Delta H-nr) and the thermal diffusivity (alpha) exhibit a sharp minimum at a composition x = 6. A broad hump is also seen in glass transition and crystallization temperatures in the composition range 5 <= x <= 7. The results obtained clearly indicate a sharp thermally reversing window in As45Te55-xIx chalcohalide glasses around the composition x = 6. (c) 2008 Elsevier B.V. All rights reserved.
机译：已使用温度调制的交替差分扫描法评估了块状As45Te55-xIx硫代卤化物玻璃（3 <= x <= 10）的不同热参数的组成依赖性，例如玻璃化转变温度，不可逆焓，热扩散率等。量热法（ADSC）和光热变形（PTD）研究。结果发现，即使平均配位数（T）变化很大，As45Te55-xIx玻璃的玻璃化转变温度也没有太大变化。已经基于网状玻璃的玻璃化转变温度的变化是由平均键能而不是T所决定的理解了。此外，发现不可逆焓（ΔH-nr）和在组分x = 6时，热扩散率（α）表现出极大的最小值。在玻璃化转变和结晶温度范围5 <= x <= 7内，也观察到了较大的驼峰。获得的结果清楚地表明，存在一个强烈的热反向窗口在As45Te55-xIx周围的卤化银眼镜中组成x =6。（c）2008 Elsevier BV保留所有权利。

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