Vibrational study of dawsonite type compounds MAl(OH)2CO3 (M = Na, K, NH4)
Infrared and Raman spectra of polycrystalline dawsonite type compounds MAl(OH)2CO3 (M = Na, K, NH4) have been obtained between 4000 and 40 cm-1. The data are interpreted on the basis of the factor group analysis of the proposed structures (D28 2h for Na and K dawsonite and D17 2h for NH4 dawsonite). In the dawsonites, lattice vibrational modes are clearly separated from the internal at around 700 cm-1. Most of the internal (OH- and CO2- 3) modes are identified and agree well with theoretical predictions. Vibrations of the OAl unit are responsible for the main features in the 700-250 cm-1 region. © 1985.
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| Main Authors: | , , |
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| Format: | artículo biblioteca |
| Language: | English |
| Published: |
Elsevier
1985
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| Online Access: | http://hdl.handle.net/10261/71499 |
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