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Journal Article

Phase transition in GeF2 driven by change of type of intermolecular interaction

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Mühle,  C.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Quantum Materials (Hidenori Takagi), Max Planck Institute for Solid State Research, Max Planck Society;

/persons/resource/persons280091

Jansen,  M.
Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Usvyat, D., Yin, C. L., Wälz, G., Mühle, C., Schütz, M., & Jansen, M. (2012). Phase transition in GeF2 driven by change of type of intermolecular interaction. Physical Review B, 86(5): 054102.


Cite as: https://hdl.handle.net/21.11116/0000-000E-C2C2-B
Abstract
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.