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The two solid phases of chlorodifluoromethane
The crystal structure of the two phases of chlorodifluoromethane (CHClF 2 ) were determined at 70 K and 10 K using Rietveld refinement of neutron powder profiles. The upper phase is tetragonal P4 2 /n (C 4 4 h ) with eight molecules in the unit cell occupying general positions. The lattice constants...
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| Published in: | Molecular physics 1997-01, Vol.90 (1), p.49-54 |
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| Main Authors: | , , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | The crystal structure of the two phases of chlorodifluoromethane (CHClF
2
) were determined at 70 K and 10 K using Rietveld refinement of neutron powder profiles. The upper phase is tetragonal P4
2
/n (C
4
4
h
) with eight molecules in the unit cell occupying general positions. The lattice constants are a = 10*3711(1) Å and c = 5*5915(2) Å. The lower phase is monoclinic P112/n (C
2
4
h
) with eight molecules in the unit cell with dimensions a = 10*1106(2), b = 10*4830(2), c = 5*5868(2) Å and γ = 90*319(2)°. The asymmetric unit has two molecules in general positions. The phase transition is of a displacive type but there are no large changes in the molecular positions or orientations at the transition. |
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| ISSN: | 0026-8976 1362-3028 |
| DOI: | 10.1080/002689797172859 |