Abstract
The statistic short-range order (SRO) structure parameters of the Ga-Sn alloy melt are obtained with the X-ray diffractometer. The local atomic and electronic structures around the absorption atoms of Ga and Sn elements are detected by X-ray absorption fine structure spectrum. Centered on the absorption atom, the atom cluster structure was dissected and the atom cluster model was established. Unlike the ordinary liquid metal structure, the local atomic structure demonstrates that the liquid Ga-Sn alloy is not characterized by a dominant icosahedral short-range order. Specially, Sn atoms aggregate in Ga91.6Sn8.4 alloy, giving rise to a phase separation that exhibits compositional disorder.
Highlights
It is difficult to characterize the liquid structure because of the absence of long-range atomic order in the liquid state.[1]
We have investigated the local structures of the normal and undercooled liquid Ga85.8In14.2 alloy by using X-ray absorption spectroscope and the results indicated that the 13-coordinated polyhedron gradually evolves into 12-coordinated polyhedron with decreasing temperature in our previous report.[15]
We found that the icosahedral short-range order is not the dominant atomic cluster in the liquid Ga-Sn alloy
Summary
It is difficult to characterize the liquid structure because of the absence of long-range atomic order in the liquid state.[1] Numerous of effort have been devoted to understanding the structure of liquid metals and alloys since the accurate information of liquid structure is essential to analyze the microstructure and physicochemical properties of its solid.[2] In 1952, Frank proposed that icosahedral short-range order (ISRO) presents in liquids initially.[3] Following his work, many researchers have found the icosahedral short-range order and distorted icosahedral short-range order in the bulk metallic melt.[4,5,6,7,8,9,10] In addition, some researchers found that the ISRO is evidenced already above the melting point and becomes more pronounced in the undercooled state with decreasing temperature.[11,12]. We found that the icosahedral short-range order is not the dominant atomic cluster in the liquid Ga-Sn alloy
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