## Abstract The mode assignment of the cubic phase of anhydrous Na~2~MoO~4~ was carried out on the basis of lattice dynamic calculation using the classical rigidβion model. Temperatureβdependent studies indicate that this crystal remains in the cubic structure in the 15β773 K range and undergoes a
Temperature-dependent Raman scattering spectra of CsBi(MoO4)2
β Scribed by M. Maczka; S. Kojima; J. Hanuza
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 225 KB
- Volume
- 61
- Category
- Article
- ISSN
- 0022-3697
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β¦ Synopsis
Successive phase transitions in CsBi(MoO 4 ) 2 at 125 and 325 K have been studied by Raman spectroscopy. The changes in the crystal structure, induced by the low-temperature first-order transition, have been discussed. The found anomalous shifts of some internal modes towards lower frequency with decreasing temperature have been explained as a result of strengthening of double or single oxygen bridges. The present results also provide information on the origin of the unknown phase, identified recently in CsDy(MoO 4 ) 2 .
π SIMILAR VOLUMES
The Raman spectra of CaFe 2 O 4 were measured with several exact scattering configurations between 20 and 520 K and the symmetry of all observed Raman lines was determined. The A g and B 2g lines were assigned to definite phonon modes by comparison to the results of lattice dynamical calculations. N
## Abstract We have measured polarized Raman spectra of MnWO~4~ single crystals at low temperatures, and studied the temperature dependence of the various phonon modes. From our Raman studies of the MnWO~4~, a new transition temperature, βΌ180 K, was found. We have completely assigned the symmetries