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Infrared and Raman spectroscopy of mullite-type Bi2Ga4O9

✍ Scribed by A. Beran; E. Libowitzky; M. Burianek; M. Mühlberg; C. Pecharromán; H. Schneider

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
401 KB
Volume
43
Category
Article
ISSN
0232-1300

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✦ Synopsis

Mullite-type Bi 2 Ga 4 O 9 single-crystals were grown by the top-seeded solution growth (TSSG) method and investigated 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 IR spectra of sol-gel-derived samples were also recorded. Using model calculations and comparison to other mullite-type compounds, bands at ~ 850 -400 cm -1 could be assigned to stretching and bending vibrations of the structural GaO 4 and GaO 6 units. Low-energetic modes were attributed to motions involving Bi atoms. The IR spectra of Bi 2 Ga 4 O 9 display close similarities to those of the mullite-type alkali gallates (9Ga 2 O 3 • Rb 2 O), while their differences to those of mullite sensu stricto (3Al 2 O 3 • 2SiO 2 and 2Al 2 O 3 • SiO 2 , repectively) are assigned to Si-O stretching vibrations of the corresponding tetrahedral units. Dedicated to Prof. Ladislav Bohatý on the occasion of his 60 th birthday

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Single-crystal growth and characterizati
Single-crystal growth and characterization of mullite-type orthorhombic Bi2M4O9 (M = Al3+, Ga3+, Fe3+)
✍ M. Burianek; M. Mühlberg; M. Woll; M. Schmücker; Th. M. Gesing; H. Schneider 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 189 KB 👁 1 views

Pure and homogeneous single crystals of orthorhombic mullite-type Bi 2 M 4 O 9 (M = Al 3+ , Ga 3+ , Fe 3+ ), and a mixed Bi 2 Fe 1.7 Ga 2.3 O 9 crystal from an equimolar Ga/Fe composition were grown by the top seeded solution growth (TSSG) method. All these compounds melt incongruently in the range