Abstract
The three-phase coexisting curve of Ar hydrate + water + gas has been investigated in a pressure range up to 485 MPa and a temperature range of (279.57 to 305.32) K. The Raman spectrum of intermolecular O-O stretching vibra- tion mode has been measured for Ar hydrate crystal along the stability boundary curve. Both the discontinuity of slope of the three-phase coexisting curve and the pressure dependence of the Raman shift reveal that two structural phase transition points exist at (281±1) MPa and (302.7±0.1) K, (456±1) MPa and (304.6±0.1) K in a pressure range up to 485 MPa for the Ar hydrate system.
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