Phase Transition in GeF2driven by Change of Type of Intermolecular Interaction
Physical review B, Condensed matter and materials physics(2012)
摘要
A first-order phase transition from the low-temperature P2(1)2(1)2(1) (alpha) phase to the high-temperature Pnma (beta) phase of the GeF2 crystal is studied experimentally and theoretically. GeF2 consists of covalently bonded chains, which arrange to the three-dimensional crystal due to noncovalent intermolecular forces. In addition to relatively strong electrostatic and van der Waals interactions, the alpha phase features anisotropic "electrostatic bonds" (reminiscent of hydrogen bonds). During the phase transition these electrostatic bonds melt, which causes expansion of the lattice, driven by excess exchange repulsion, until compensated by the remaining interchain interactions.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要