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Narushima, Takashi*; Hattori, Takanori; Kinoshita, Tomohiro*; Hinzmann, A*; Tsuji, Kazuhiko*
Physical Review B, 76(10), p.104204_1 - 104204_8, 2007/09
Times Cited Count：25 Percentile：68.43(Materials Science, Multidisciplinary)The structure of liquid Sn was investigated up to 19.4 GPa by synchrotron X-ray diffraction. Upon compression up to about 3-6 GPa, the structural features, which reflect the anisotropic local structure become less prominent; i.e., the hump on the high-
side of the first peak in the structure factor 
becomes smaller, the position of the second peak relative to that of the first peak in , 
, decreases, and the coordination number, CN, increases. These features indicate that the liquid structure changes toward a simple liquid metal upon compression. However, at higher pressures, the structural parameters nearly unchanged. The parameters in this pressure range are still deviated from their respective values for simple liquid metals. These findings suggest that, contrary to previous expectations, the liquid does not monotonically approach a simple liquid metal, but takes a relatively stable intermediate form with an anisotropic local structure before approaching a simple liquid metal. The high-pressure behavior of liquid Sn is compared to those of liquid Si and liquid Ge and the systematics in liquid group 14 elements are discussed.
Hattori, Takanori; Taga, Naohito*; Takasugi, Yukinobu*; Kinoshita, Tomohiro*; Narushima, Takashi*; Tsuji, Kazuhiko*; Kikegawa, Takumi*
Photon Factory Activity Report 2005, Part A, p.42 - 43, 2006/11
no abstracts in English
Hattori, Takanori; Kinoshita, Tomohiro*; Narushima, Takashi*; Tsuji, Kazuhiko*; Katayama, Yoshinori
Physical Review B, 73(5), p.054203_1 - 054203_9, 2006/02
Times Cited Count：23 Percentile：68.23(Materials Science, Multidisciplinary)The structure of liquid CdTe was investigated at pressures up to 23.5GPa using synchrotron X-ray diffraction. The structure factor, S(Q), and the pair distribution function, g(r), drastically change in two pressure regions, 1.8-3.0 GPa and 7.0-9.0 GPa, accompanied with marked increase in the average coordination number, CN. These findings suggest that there exists at least three stable liquid forms below 23.5GPa. The pressure interval of the structural change is much smaller compared to other liquids of tetrahedrally bonded materials. Comparing the shapes of S(Q) and g(r), and other structural parameters with the respective data for the reference materials reveals that the lowest- and intermediate-pressure forms have the same local structures as the crystalline counterpart (zinc-blende-like local structure and a NaCl-like local structure), while the highest-pressure form has a different local structure from that in the crystalline form.
Hattori, Takanori; Mori, Tetsuji*; Narushima, Takashi*; Funamori, Nobumasa*; Tsuji, Kazuhiko*
no journal, ,
In the previous studies for the pressure-induced structural changes in liquids of tetrahedrally bonded materials, the followings are elucidated. (1) With increasing pressure, the anisotropy in local structures becomes smaller and liquids approach simple liquid metals. (2) The pressure-induced changes become less prominent and the liquids take a unique structure which does not change by compression. (3) As a result, the liquid preserves anisotropy in the local structure at pressures where the crystalline counterpart loses the anisotropy. In our previous studies, the pressure-induced changes were analyzed with the distorted crystalline model. However, this model assumes the existence of the crystalline-type local structure. In the present study, we analyzed it with a RMC method, which does not involve such assumption. Based on the results, we discuss the high-pressure evolution of the local structures in the liquids.
