High pressure-high temperature phase diagram of ammonia

The Journal of Chemical Physics
S Ninet, Frédéric Datchi

Abstract

The high pressure (P)-high temperature (T) phase diagram of solid ammonia has been investigated using diamond anvil cell and resistive heating techniques. The III-IV transition line has been determined up to 20 GPa and 500 K both on compression and decompression paths. No discontinuity is observed at the expected location for the III-IV-V triple point. The melting line has been determined by visual observations of the fluid-solid equilibrium up to 9 GPa and 900 K. The experimental data are well fitted by a Simon-Glatzel equation in the covered P-T range. These transition lines and their extrapolations are compared to the reported ab initio calculations.

References

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Citations

Aug 11, 2011·The Journal of Physical Chemistry. a·Bethany A Chidester, Timothy A Strobel
Aug 17, 2010·The Journal of Chemical Physics·H E Maynard-CaselyJ S Loveday
Aug 18, 2012·The Journal of Chemical Physics·J G O OjwangAlexander F Goncharov
Jun 28, 2013·The Journal of Chemical Physics·Mandy BethkenhagenRonald Redmer
Sep 19, 2020·Materials·Guozhao ZhangFrédéric Datchi
Oct 21, 2017·Nature Communications·C LiuS Ninet
Sep 28, 2017·Scientific Reports·Dafang LiPing Zhang
Oct 24, 2020·The Journal of Chemical Physics·H ZhangS Ninet
Jan 30, 2021·Physical Review Letters·A RavasioT Vinci
Jun 12, 2012·Physical Review Letters·S NinetA M Saitta
Mar 31, 2021·Proceedings of the National Academy of Sciences of the United States of America·Tomoaki Kimura, Motohiko Murakami

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Methods Mentioned

BETA
x-ray diffraction

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