Raman and IR studies of TaWO5.5, ASbWO6 (A = K, Rb, Cs, Tl), and ASbWO6·H2O (A = H, NH4, Li, Na) pyrochlore oxides
Version of Record online: 24 JUN 2010
Copyright © 2010 John Wiley & Sons, Ltd.
Journal of Raman Spectroscopy
Volume 42, Issue 3, pages 529–533, March 2011
How to Cite
Ma̧czka, M., Knyazev, A. V., Kuznetsova, N. Yu., Ptak, M. and Macalik, L. (2011), Raman and IR studies of TaWO5.5, ASbWO6 (A = K, Rb, Cs, Tl), and ASbWO6·H2O (A = H, NH4, Li, Na) pyrochlore oxides. J. Raman Spectrosc., 42: 529–533. doi: 10.1002/jrs.2735
- Issue online: 20 MAR 2011
- Version of Record online: 24 JUN 2010
- Manuscript Accepted: 22 MAY 2010
- Manuscript Received: 2 MAR 2010
- defect pyrochlores;
- Raman scattering;
- infrared spectra
Raman and infrared (IR) spectra of defect pyrochlores TaWO5.5, NH4SbWO6·H2O, HSbWO6·H2O, LiSbWO6·H2O, NaSbWO6·H2O, KSbWO6, RbSbWO6, CsSbWO6, and TlSbWO6 were measured. The obtained spectra are discussed using the factor group approach for the cubic Fd-3m space group, and assignment of bands to respective motions of atoms is proposed. Our results show that the phonon properties of the pyrochlores are strongly affected by disorder, and therefore Raman and IR spectroscopies are very useful tools in studying disorder in this family of compounds. In particular, our studies have shown that in these ionic conductors disorder at sites occupied by NH, H+, or alkali-metal ions decreases with increasing size and mass of these ions. Copyright © 2010 John Wiley & Sons, Ltd.