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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 >Chemical ordering and fragility minimum in Cu-As-Se glasses
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Chemical ordering and fragility minimum in Cu-As-Se glasses

机译：Cu-As-Se玻璃的化学有序性和脆性最小

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Modulated Differential Scanning Calorimetric (MDSC) studies have been performed on CuxAs40Se60-x glasses with x ranging between 0 and 30 at.%. The thermal parameters, namely the glass transition temperature (T-g), the heat capacity (C-p) and the jump in heat capacity at the glass transition (Delta C-p) are measured. The composition dependence of these thermal parameters has been found to exhibit interesting variations particularly at x = 20. Thermal crystallization studies show that the structural network is mainly characterized by the ternary Cu3AsSe4 units with As2Se3 and Cu2As3 units depending on the concentration of Cu. These structural differences arising as a function of composition are reflected in the T-g, C-p and Delta C-p. The observed transitions are also understood on the basis of Formal Valence Shell (FVS) model and the classification of strong and fragile liquids. (c) 2006 Elsevier B.V. All rights reserved.
机译：已对CuxAs40Se60-x玻璃进行了调制差示扫描量热（MDSC）研究，x范围为0到30 at。％。测量热参数，即玻璃化转变温度（T-g），热容（C-p）和玻璃化转变时的热容跃迁（ΔC-p）。已经发现这些热参数的成分依赖性表现出有趣的变化，特别是在x = 20时。热结晶研究表明，结构网络的主要特征是取决于Cu浓度的三元Cu3AsSe4单元，其中As2Se3和Cu2As3单元。这些作为组成函数的结构差异反映在T-g，C-p和Delta C-p中。还可以基于形式价壳（FVS）模型以及强弱液体的分类来理解所观察到的过渡。 （c）2006 Elsevier B.V.保留所有权利。

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