Monoclinic–orthorhombic phase transition in Ba2Cu(HCOO)6 crystals: a Raman scattering study
✍ Scribed by C. W. A. Paschoal; A. P. Ayala; I. Guedes; P. T. C. Freire; F. E. A. Melo; J. Mendes Filho; A. G. Leyva; G. Polla; D. Vega; P. K. Perazzo
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 153 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0377-0486
- DOI
- 10.1002/jrs.808
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Ta 2 O 5 ceramics and crystals were prepared and analyzed using Raman spectroscopy in the temperature range 25-873 K. The low-energy phonon bands (n < 100 cm -1 ) of Ta 2 O 5 are assigned to external modes originating from the interaction between different Ta polyhedra and TaO n 5-2n -Ta 6 O 12 6Y c
Effects of the phase transition between the high-temperature tetragonal phases of the CsScF 4 crystal were studied by Raman scattering. The appearance of new lines including a soft mode was observed below the phase transition point, in complete accordance with the new crystal symmetry. The behavior