Infrared and Raman spectroscopy of mullite-type Bi2Ga4O9
- Author(s)
- Eugen Libowitzky, Anton Beran
- Abstract
Mullite-type Bi2Ga4O9 single-crystals were grown by the top-seeded solution growth (TSSG) method andinvestigated by vibrational spectroscopy. Polarised IR specular reflectance and attenuated total reflectance(ATR) spectra, as well as polarised micro-Raman spectra were acquired at room temperature. Powder IRspectra of sol-gel-derived samples were also recorded. Using model calculations and comparison to othermullite-type compounds, bands at ~ 850 - 400 cm-1 could be assigned to stretching and bending vibrations ofthe structural GaO4 and GaO6 units. Low-energetic modes were attributed to motions involving Bi atoms. TheIR spectra of Bi2Ga4O9 display close similarities to those of the mullite-type alkali gallates (9Ga2O3 - Rb2O),while their differences to those of mullite sensu stricto (3Al2O3 - 2SiO2 and 2Al2O3 - SiO2, repectively) areassigned to Si-O stretching vibrations of the corresponding tetrahedral units.
- Organisation(s)
- Department of Mineralogy and Crystallography
- Journal
- Crystal Research and Technology: journal of experimental and industrial crystallography
- Volume
- 43
- Pages
- 1230-1239
- No. of pages
- 10
- ISSN
- 0232-1300
- Publication date
- 2008
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105113 Crystallography, 1030 Physics, Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/6a1d7299-2ccc-4d2e-9b10-6ee2ecef7e14