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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 >Determination of the two-melt phase boundary and study of the binary diffusion in liquid Bi-Ga system with a miscibility gap
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Determination of the two-melt phase boundary and study of the binary diffusion in liquid Bi-Ga system with a miscibility gap

机译：具有互溶间隙的液态Bi-Ga体系中两熔体相边界的确定和二元扩散的研究

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摘要

New data on the shape of the two-melt phase boundary of the bismuth-gallium system with a miscibility gap have been obtained by a gamma-ray attenuation technique. According to the measurements the coordinates of the critical point of the liquid-liquid coexistence curve are: critical temperature TC 532.3 +/- 1.5 K; critical composition N-C = 29.5 +/- 0.3 at.% Bi. In an extended range around T-C the critical exponent beta of the coexistence curve equals 0.310 +/- 0.005, which agrees closely with non-classical value calculated by the method of high-temperature series expansions. Kinetics of homogenisation of the Bi-Ga melt of near-critical composition have been investigated over the temperature range from 570 to 1225 K using the same technique. The temperature dependence of the coefficient of binary diffusion D derived from these measurement has been found to obey the Arrhenius equation: D(T) = 1.67 x 10(-3) exp[-27175/RT], cm(2) s(-1), for the concentration range 20-40 at.% Bi. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 21]
机译：通过伽马射线衰减技术获得了具有可混溶间隙的铋-镓体系的两熔融相边界的形状的新数据。根据测量，液-液共存曲线的临界点的坐标为：临界温度TC 532.3 +/- 1.5 K;临界组成N-C = Bi的29.5 +/- 0.3 at。在T-C附近的扩展范围内，共存曲线的临界指数β等于0.310 +/- 0.005，这与通过高温系列膨胀法计算的非经典值非常吻合。使用相同的技术，已经在570至1225 K的温度范围内研究了近临界组成的Bi-Ga熔体的均质化动力学。从这些测量值得出的二元扩散系数D的温度依赖性已发现遵循Arrhenius方程：D（T）= 1.67 x 10（-3）exp [-27175 / RT]，cm（2）s（- 1），Bi的浓度范围为20-40 at。％。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：21]

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