Temperature-dependent Raman scattering studies on Na2Mo2O7 disodium dimolybdate
Article first published online: 23 NOV 2010
Copyright © 2010 John Wiley & Sons, Ltd.
Journal of Raman Spectroscopy
Volume 42, Issue 5, pages 1114–1119, May 2011
How to Cite
Saraiva, G. D., Paraguassu, W., Maczka, M., Freire, P. T. C., de Sousa, F. F. and Mendes Filho, J. (2011), Temperature-dependent Raman scattering studies on Na2Mo2O7 disodium dimolybdate. J. Raman Spectrosc., 42: 1114–1119. doi: 10.1002/jrs.2836
- Issue published online: 20 MAY 2011
- Article first published online: 23 NOV 2010
- Manuscript Accepted: 5 OCT 2010
- Manuscript Received: 13 SEP 2010
- sodium molybdate;
- phase transition;
- Raman scattering
Temperature–dependent Raman studies of disodium dimolybdate (Na2Mo2O7) crystal are reported. Lattice dynamical calculation was used to predict both wavenumbers and atomic displacements (eigenvectors) for the vibrational modes. These calculations were based on the classical rigid-ion model. The high-temperature Raman scattering study of the crystal showed that it remains in the orthorhombic structure in the 8–848 K range and undergoes a structural phase transition between 848 and 854 K. This phase transition is most likely connected with weak tiltings and/or rotations of both MoO4 (tetrahedra) and MoO6 (octahedra) units, which lead to a disorder in the oxygen sublattice. Copyright © 2010 John Wiley & Sons, Ltd.