Synthesis and stability of hydrogen iodide at high pressures

Jack Binns, Xiao-Di Liu, Philip Dalladay-Simpson, Veronika Afonina, Eugene Gregoryanz, and Ross T. Howie
Phys. Rev. B 96, 144105 – Published 11 October 2017

Abstract

Through high-pressure Raman spectroscopy and x-ray diffraction experiments, we have investigated the formation, stability field, and structure of hydrogen iodide (HI). Hydrogen iodide is synthesized by the reaction of molecular hydrogen and iodine at room temperature and at a pressure of 0.2 GPa. Upon compression, HI solidifies into cubic phase I, and we present evidence for the emergence of a phase I above 3.8 GPa. Across the wide temperature regime presented here, HI is unstable under compression (11 GPa at 300 K, 18 GPa at 77 K), decomposing into its constituent elements, after which no further reaction between hydrogen and iodine was observed up to pressures of 60 GPa. This study provides both the constraints on the phase diagram of HI and its kinetic stability.

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  • Received 7 August 2017

DOI:https://doi.org/10.1103/PhysRevB.96.144105

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jack Binns1, Xiao-Di Liu2, Philip Dalladay-Simpson1, Veronika Afonina3, Eugene Gregoryanz1,2,3, and Ross T. Howie1,*

  • 1Center for High Pressure Science Technology Advanced Research, Shanghai, People's Republic of China
  • 2Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, People's Republic of China
  • 3Centre for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom

  • *ross.howie@hpstar.ac.cn

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Issue

Vol. 96, Iss. 14 — 1 October 2017

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