论文标题
超电基冰的多态性
Polymorphism of superionic ice
论文作者
论文摘要
自然环境中的水很丰富，但是它驻留在行星内部的形式仍然不确定。我们报告了在激光加热的钻石砧室中H2O的同步X射线衍射和光谱测量的组合，高达150 gigapascals（GPA）（GPA）和6500 kelvin（k）（K），揭示向ICE的一阶过渡到ICES，并揭示了带有体重的Cutice（BCC）和20个Cubitecic Cubtice（Fcce）（FCCIC）（FCCIC）（fcciic cubtic（Fcc））（fcciic cubtic（Fcciic）（fcc）lccy（fcciic）（fcciic cubtic）（fcc）lccy（fcc） （29）GPA。我们将这些结构分配给理论上预测的超级议会阶段，基于独特的密度，增加的光电导率以及融合的焓大大降低。我们的测量结果解决了理论预测与各种静态/动态实验之间的当前差异，这些实验在压力温度相图中融化曲线和超级离子相（S）的存在和位置，表明在水丰富的巨型行星中可能存在FCC - 舒适相位的传统巨型巨型行星，例如，加人类和天体。
Water is abundant in natural environments but the form it resides in planetary interiors remains uncertain. We report combined synchrotron X-ray diffraction and optical spectroscopy measurements of H2O in the laser-heated diamond anvil cell up to 150 gigapascals (GPa) and 6500 kelvin (K) that reveal first-order transitions to ices with body-centered cubic (bcc) and face-centered cubic (fcc) oxygen lattices above 900 (1300) K and 20 (29) GPa, respectively. We assigned these structures to theoretically predicted superionic phases based on the distinct density, increased optical conductivity, and greatly decreased enthalpies of fusion. Our measurements address current discrepancies between theoretical predictions and various static/dynamic experiments on the existence and location of melting curve and superionic phase(s) in the pressure-temperature phase diagram indicating a possible presence of the conducting fcc-superionic phase in water-rich giant planets, such as Neptune and Uranus.
