Small- and wide-angle scattering measurement of suppression of Peielrs distortion in liquids

众所周知，在晶体系统中存在压力诱导的扭曲抑制。对于液体，同样的由压力引起的结构变化是可以预料到的。为了弄清这种结构变化的可能性以及压力如何影响液体中的结构，我们在高压和高温下进行了x射线衍射测量。我们设计了一种新的压力电池，以覆盖大范围（即低散射角）的波动，并研究了聚合物熔体和液体GeTe混合物。对于聚合物熔体，我们首次发现了压力诱导的二阶相转变，对于液体GeTe，我们澄清了该液体体系在压力下的相图。

It is well-known that there are pressure-induced suppressions of distortions in crystalline systems. For liquids, same kinds of pressure-induced structural changes have been expected. To clarify the possibility of such structural changes and how pressure affect the structure in liquids, we performed x-ray diffraction measurements under high pressure and high temperature. We designed a new pressure cell to cover wide scale (i.e., low scattering angles) of fluctuations, and studied polymer melt and liquid GeTe mixtures. For the polymer melt, we found a pressure-induced second-order-like phase transition for the first time, and for the liquid GeTe, we clarified the phase diagram of this liquid system under pressure.