The crystal structure of methane B at 8 GPa--an α-Mn arrangement of molecules
From a combination of powder and single-crystal synchrotron x-ray diffraction data we have determined the carbon substructure of phase B of methane at a pressure of ∼8 GPa. We find this substructure to be cubic with space group I4¯3m and 58 molecules in the unit cell. The unit cell has a lattice par...
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| Veröffentlicht in: | The Journal of chemical physics 2014-12, Vol.141 (23), p.234313-234313 |
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| container_issue | 23 |
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| container_title | The Journal of chemical physics |
| container_volume | 141 |
| creator | Maynard-Casely, H E Lundegaard, L F Loa, I McMahon, M I Gregoryanz, E Nelmes, R J Loveday, J S |
| description | From a combination of powder and single-crystal synchrotron x-ray diffraction data we have determined the carbon substructure of phase B of methane at a pressure of ∼8 GPa. We find this substructure to be cubic with space group I4¯3m and 58 molecules in the unit cell. The unit cell has a lattice parameter a = 11.911(1) Å at 8.3(2) GPa, which is a factor of √2 larger than had previously been proposed by Umemoto et al. [J. Phys.: Condens. Matter 14, 10675 (2002)]. The substructure as now solved is not related to any close-packed arrangement, contrary to previous proposals. Surprisingly, the arrangement of the carbon atoms is isostructural with that of α-manganese at ambient conditions. |
| doi_str_mv | 10.1063/1.4903813 |
| format | Article |
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We find this substructure to be cubic with space group I4¯3m and 58 molecules in the unit cell. The unit cell has a lattice parameter a = 11.911(1) Å at 8.3(2) GPa, which is a factor of √2 larger than had previously been proposed by Umemoto et al. [J. Phys.: Condens. Matter 14, 10675 (2002)]. The substructure as now solved is not related to any close-packed arrangement, contrary to previous proposals. 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We find this substructure to be cubic with space group I4¯3m and 58 molecules in the unit cell. The unit cell has a lattice parameter a = 11.911(1) Å at 8.3(2) GPa, which is a factor of √2 larger than had previously been proposed by Umemoto et al. [J. Phys.: Condens. Matter 14, 10675 (2002)]. The substructure as now solved is not related to any close-packed arrangement, contrary to previous proposals. 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We find this substructure to be cubic with space group I4¯3m and 58 molecules in the unit cell. The unit cell has a lattice parameter a = 11.911(1) Å at 8.3(2) GPa, which is a factor of √2 larger than had previously been proposed by Umemoto et al. [J. Phys.: Condens. Matter 14, 10675 (2002)]. The substructure as now solved is not related to any close-packed arrangement, contrary to previous proposals. Surprisingly, the arrangement of the carbon atoms is isostructural with that of α-manganese at ambient conditions.</abstract><cop>United States</cop><pub>American Institute of Physics</pub><pmid>25527941</pmid><doi>10.1063/1.4903813</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record> |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | CARBON CRYSTAL STRUCTURE INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY LATTICE PARAMETERS MANGANESE METHANE MOLECULES MONOCRYSTALS POWDERS PROPOSALS SPACE GROUPS SYNCHROTRONS X-RAY DIFFRACTION |
| title | The crystal structure of methane B at 8 GPa--an α-Mn arrangement of molecules |
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