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Investigation of the phase diagram of ammonia by Raman scattering

✍ Scribed by M. Gauthier; Ph. Pruzan; J.M. Besson; G. Hamel; G. Syfosse

Publisher
Elsevier Science
Year
1986
Weight
188 KB
Volume
139-140
Category
Article
ISSN
0378-4363

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✦ Synopsis

Raman spectra of the solid phases I, II and llI of ammonia are reported in the range 214 to 280 K up to 870 MPa. The lattice modes of phase I (primitive cubic) have been observed at 214 K up to 680 MPa. Solid II (hexagonal) is characterized by strongly attenuated lattice modes whereas in solid III (face centered cubic) such modes are not observed according to the symmetry rules. In the range 600 to 800 MPa the II-III transition line is located around 252 to 262 K. In the whole domain investigated internal modes of the molecule were recorded.

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