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Temperature-dependent Raman scattering studies on Na2Mo2O7 disodium dimolybdate

✍ Scribed by G. D. Saraiva; W. Paraguassu; M. Maczka; P. T. C. Freire; F. F. de Sousa; J. Mendes Filho

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
459 KB
Volume
42
Category
Article
ISSN
0377-0486

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✦ Synopsis

Abstract

Temperature–dependent Raman studies of disodium dimolybdate (Na~2~Mo~2~O~7~) 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 MoO~4~ (tetrahedra) and MoO~6~ (octahedra) units, which lead to a disorder in the oxygen sublattice. Copyright © 2010 John Wiley & Sons, Ltd.

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✍ G. D. Saraiva; W. Paraguassu; M. Maczka; P. T. C. Freire; J. A. Lima Jr.; C. W. 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 465 KB

## 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 rigid‐ion model. Temperature‐dependent studies indicate that this crystal remains in the cubic structure in the 15–773 K range and undergoes a