The void and meso-scale structure in the liquid chalcogens

在液态Se和液态Se-Te混合物中，随着温度的升高，发生了金属到非金属的转变。用BL28B2束线在SPRIN8上进行了高温高压下的X射线散射测量，研究了这一转变过程中的结构变化。为了研究中尺度的结构变化，发展了反蒙特卡罗技术和Delaunay划分方法分析空穴结构。结果表明，在过渡区周围，硫族链结构由螺旋结构转变为锯齿状或环状结构。

The metal to nonmetal transition occurs in the liquid Se and liquid Se-Te mixtures with increasing temperature. The structural change at this transition was investigated with X-ray scattering measurements at high temperature and under high pressure by using the BL28B2 beam line at SPring8. In order to investigate the intermediate scale structural change, the reverse Monte Carlo technique and the void structure analysis with Delaunay dividing method were developed. It was found that around the transition region the structure of chalcogen chains changed from helix to zigzag or ring ones.