title: Phase transformation of methane hydrate under high pressure.
abstract: In situ Raman spectroscopy is employed to study the phase behavior of methane hydrate at high pressure. The structure 1 of methane hydrate can be maintained up to 950 MPa at 299 K. The transformation of structure I<-->structure H+water+CH4 occurs at 880 MPa and 323 K. The structure H of methane hydrate, however, decomposes to methane and water at 960 MPa and 348 K. The initiation mechanism of methane hydrate sI is also discussed.
authors.affiliation: School of Earth and Space Science, Peking University, Peking 100871, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Sun
authors.forename: Ti-Yu
authors.initials: TY
authors.lastname: Duan
authors.forename: Hai-Fei
authors.initials: HF
authors.lastname: Zheng
authors.forename: Jian-Qing
authors.initials: JQ
authors.lastname: Ji
authors.forename: Xiang-Yang
authors.initials: XY
authors.lastname: Wu