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Unravelling decomposition products of phosphine under high pressure
Author(s) -
Liu Mingkun,
Huang Xiaoli,
Wang Xin,
Huang Yanping,
Li Fangfei,
Wu Gang,
Li Xin,
Liang Yongfu,
Zhou Di,
Lu Mengya,
Liu Bingbing,
Cui Tian
Publication year - 2018
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5325
Subject(s) - raman spectroscopy , decomposition , phosphine , chemistry , analytical chemistry (journal) , high pressure , ambient pressure , superconductivity , hydrogen , inorganic chemistry , organic chemistry , thermodynamics , catalysis , physics , optics , quantum mechanics
Recently, the superconductivity in phosphine (PH 3 ) has been discovered with the superconducting transition temperature T c up to 203 GPa by using high pressure resistance measurements. However, the structural information of PH 3 under high pressure remains elusive. Motivated by this, in this work, the behavior of PH 3 under high pressure has been investigated by Raman spectroscopy at 298 K. The Raman spectra varied with pressure increasing, accompanying with the change of the sample color, which first became yellow, then red, and finally opaque. In the pressure range of 8.53–18.36 GPa, the decomposition of PH 3 was observed, and the main decomposition products were P 2 H 4 and element hydrogen (H 2 ). Upon compression to higher pressure, the Raman signal of hydrogen vibration was observed to become stronger, indicating that PH 3 or P 2 H 4 further decomposed into element phosphorus and hydrogen. The original PH 3 did not form again upon decomposition to ambient pressure. P 2 H 4 and other decomposition products of compressed phosphine were considered as main products of the high temperature superconducting phase reported in experiment.