Atomic structure and viscosity behavior in Cu₃₇Sb₆₃ and Cu₂₀Sb₈₀ melts

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• 作者：Fengxiang Guo^a ; ¹ ; Yu Tian^b ; ¹ ; Hongliang Zheng^a ; Tongtong Li^a ; Xiaobei Liu^a ; Xiaomei Xu^a ; Jingyu Qin^a ; Xubo Qin^a ; Xuelei Tian^a ; ^{tianxuelei@sdu.edu.cn}
• 关键词：Melts structure ; Viscosity ; High temperature XRD ; Phase transformation ; Solidification
• 刊名：Materials Letters
• 出版年：2013
• 出版时间：15 March, 2013
• 年：2013
• 卷：95
• 期：Complete
• 页码：128-130
• 全文大小：408 K

文摘

Atomic structure of Cu₃₇Sb₆₃ and Cu₂₀Sb₈₀ melts has been studied by high temperature X-ray diffraction and viscosity measurement. Split main peaks indicate Cu-Sb heterogeneous and Sb-homogeneous clusters dominate in these two melts, respectively. This results in the smaller first-neighbor radius and higher viscosity in Cu₃₇Sb₆₃ melts. In pair distribution functions of Cu₂₀Sb₈₀ melts, the hump around 0.44 nm becomes obvious below 973 K, which reveals the reinforcement of Sb clusters with Peierls distortion. This is consistent with the increase in viscous-flow activation energy in Cu₂₀Sb₈₀ melts around 973 K. Structure parameters change is also discussed in terms of clusters evolution during cooling.