Ti-yu Duan

Peking University

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Hai-fei Zheng

Hefei University of Technology

M. Li

Carnegie Institution for Science

Jianqing Ji

Peking University

Xiang-Yang Wu

Institute of Geology and Geophysics

Hongyu Zheng

Princeton University

Qiang Sun

Institute of Applied Physics and Computational Mathematics

Qiang Sun

Peking University

Cooperative Institutions

Peking University

Chinese Academy of Sciences

Institute of Geology and Geophysics

Xi'an University of Science and Technology

Hefei University of Technology

Chinese Academy of Geological Sciences

Guangzhou Institute of Geochemistry

Carnegie Institution for Science

Geophysical Laboratory

University at Buffalo, State University of New York

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[Applications of moissanite anvil cell for Raman spectroscopy under high-temperature and high-pressure].

PubMed (2005)

Ti-yu Duan Qiang Sun Hai-fei Zheng

This paper introduces the structure and the feature of moissanite anvil cell, which is composed of moissanite anvil, supporting and creating pressure system, heater system and metal gasket. Because of its high hardness, high heat conductance, low thermal expansion, good thermal stability and low price, moissanite is a good material of anvil for high-temperature and high-pressure experimental studies. With this cell, the Raman spectrum of sodium carbonate solution, sodium sulfate solution and distilled water has been in situ measured under high-temperature and high-pressure. With increasing pressure, it can be observed that the 1066 cm(-1) Raman modes of sodium carbonate solution and the 982 cm(-1) Raman modes of sodium sulfate solution shift to high wave numbers obviously. With increasing temperature, the frequency at maximum intensity shifts to high wave numbers, the full width at half-maximum intensity decreases in the Raman spectrum of water.

Sodium carbonate

Distilled water

Sodium sulfate

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Study of Raman Spectroscopy on Phase Relations of CaCO3 at High Temperature and High Pressure

AGU Spring Meeting Abstracts (2006)

M. Li Hongyu Zheng Ti-yu Duan

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Phase transformation of methane hydrate under high pressure

The Journal of Chemical Physics (2004)

Qiang Sun Ti-yu Duan Hai-fei Zheng Jianqing Ji Xiang-Yang Wu

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.

Clathrate hydrate

10.1063/1.1830411

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Citations (8)