The Ion-Electron Correlation Function in Liquid Metals

Abstract

The structure factors of liquid Zn at 723 K, Sn at 523 K and Bi at 573 K have been determined by neutron diffraction with sufficient accuracy and compared with those of X-ray diffraction. A remarkable difference in the structural information between the two methods is clearly found around the first peak region as well as in the slightly varied peak positions, and it is apparently larger than the experimental errors.With these facts in mind, a new method evaluating the ion-electron correlation function in liquid metals has been proposed by using the measured structural data of X-rays and neutrons, with the help of theoretical values of the electron-electron correlation function by he Utsumi-Ichimaru scheme. This method has been applied to liquid Zn, Sn and Bi, and the radial distribution function of valence electrons around an ion has been estimated, from which the ionic radius and the schematic diagram of the electron distribution map are obtained. The ionic radii evaluated in this work have been found to agree well with those proposed by Pauling.

The Structure of Liquid Metals and Alloys

“…Egelstaff らにより提案された (7) ．この試みは，1980年代後 半に計測機器の発展に伴って溶融金属の回折実験における実 験誤差が減少，とくに中性子回折実験の精度向上に伴い，例 えば図に示す液体 Zn の干渉関数のように，有意な差異が 認められるようになって実現した (8) SRO との相違 (26) という「4 つの因子」を考慮することで， 合金のガラス形成能を検討する試みが報告された (27) …”