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Mullite-type Bi 2 (Fe x Ga 1-x ) 4 O 9  (0 ≤ x ≤ 1) oxides, prepared by mecanochemical-thermal synthesis, were investigated by FTIR and Raman spectroscopies. Similarly to other mullite systems, IR (850–400 cm −1 ) and Raman bands (750–300 cm −1 ) are attributed to stretching and bending vibrations of tetrahedral and octahedral sites. A shift in the peak positions toward lower wavenumbers with the increase of iron content is observed. High-energy IR modes show only the presence of Ga-O-Ga and Ga-O-Fe/Fe-O-Ga stretching vibrations for x &lt; 0.5. Raman bands between 500 cm −1  and 400 cm −1  revealed double band splitting for x &lt; 0.5.

Infrared and Raman spectroscopy investigations in mullite-type Bi 2 (Fe x Ga 1-x ) 4 O 9 polycrystals