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Raman scattering study ofα-quartz andSi1−xGexO2solid solutions
- Source :
- Physical Review B. 79
- Publication Year :
- 2009
- Publisher :
- American Physical Society (APS), 2009.
-
Abstract
- alpha-quartz-type Si1−xGexO2 solid solutions (x=0.06, 0.11, and 0.24) and pure SiO2 were investigated by Raman spectroscopy. Coupled and decoupled vibrational modes were identified at room temperature as a function of composition. Tetrahedral tilting librational modes involved in the displacive alpha beta-quartz phase transition are decoupled. The wave number of the coupled A1 mode located at 464 cm−1 for pure alpha-quartz was found to vary quite linearly with germanium content. Raman spectra were recorded up to 1473 K. Substitution of germanium in the quartz lattice clearly improves the thermal stability of the alpha phase. The alpha beta-quartz phase transition temperature increases from 846±1 K for x=0 to about 1300±50 K for x=0.24. At the same time, the dynamic disorder observed in quartz well below the transition is reduced in the solid solutions.
- Subjects :
- Phase transition
Materials science
Analytical chemistry
chemistry.chemical_element
Germanium
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
0104 chemical sciences
Electronic, Optical and Magnetic Materials
symbols.namesake
Nuclear magnetic resonance
chemistry
Molecular vibration
symbols
Coherent anti-Stokes Raman spectroscopy
0210 nano-technology
Raman spectroscopy
Quartz
Raman scattering
Solid solution
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 79
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........727624f6700345a1260992f68a5dfc4a