论文信息 - Structural studies of solid methane at high pressures

Structural studies of solid methane at high pressures

Abstract High-pressure X-ray powder diffraction measurements for solid methane were performed at pressures up to 13 GPa. The diffraction pattern at 7.0 GPa is assigned to a rhombohedral lattice with lattice constants of a =8.643(1) A and α =89.40(2)° and with a unit cell that contains 21 molecules. The bulk modulus of the rhombohedral phase is estimated to be 7.9(3) GPa.

[1] W. B. Daniels,et al. Raman spectrum of phase III of solid CH4 in the lattice and intramolecular regions , 1979 .

[2] A. Fitch. The structure of solid carbon tetrafluoride , 1993 .

[3] K. Kobashi,et al. Raman spectra of solid CH4 under high pressure. III. New high pressure phases in solid CH4 and CD4 , 1985 .

[4] B. Post,et al. Carbon Tetrachloride: A New Crystalline Modification , 1966, Science.

[5] R. Bini,et al. High-pressure infrared study of solid methane: Phase diagram up to 30 GPa , 1997 .

[6] T. Kikegawa,et al. Application of an imaging plate to high‐pressure x‐ray study with a diamond anvil cell (invited) , 1992 .

[7] A. Nucara,et al. The near‐infrared spectrum of solid CH4 , 1992 .

[8] F. Medina,et al. Far-infrared spectrum of solid methane: phases III and IV , 1991 .

[9] F. Medina,et al. Far-infrared spectrum of solid methane. Phase II , 1986 .

[10] H. Mao,et al. Structure and compression of crystalline methane at high pressure and room temperature , 1980 .

[11] P. Calvani,et al. Weak infrared bands in solid CH4‐II , 1987 .

[12] Polian,et al. Optical studies of methane under high pressure. , 1987, Physical review. B, Condensed matter.

[13] W. Press. Structure and Phase Transitions of Solid Heavy Methane (CD4) , 1972 .

[14] H. Jodl,et al. High pressure crystal phases of solid CH4 probed by Fourier transform infrared spectroscopy , 1995 .