Infrared and Raman spectroscopy of mullite-type Bi2Ga4O9

Autor(en)

Eugen Libowitzky, Anton Beran

Abstrakt

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(en)

Institut für Mineralogie und Kristallographie

Journal

Crystal Research and Technology: journal of experimental and industrial crystallography

Band

43

Seiten

1230-1239

Anzahl der Seiten

10

ISSN

0232-1300

Publikationsdatum

2008

Peer-reviewed

Ja

ÖFOS 2012

105113 Kristallographie, 1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/6a1d7299-2ccc-4d2e-9b10-6ee2ecef7e14