ChemInform Abstract: Series of Compositions Bi2(M′xM1-x)4O9 (M′, M: Al, Ga, Fe; 0 ≤ x 1) with Mullite-Type Crystal Structure: Synthesis, Characterization and 18O/16O Exchange Experiment.

✍ Scribed by T. Debnath; C. H. Ruescher; P. Fielitz; S. Ohmann; G. Borchardt

• Publisher: John Wiley and Sons
• Year: 2011
• Weight: 25 KB
• Volume: 42
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.201107014

✦ Synopsis

Series of Compositions Bi 2 (M' x M 1-x ) 4 O 9 (M', M: Al, Ga, Fe; 0 ≤ x 1) with Mullite--Type Crystal Structure: Synthesis, Characterization and 18 O/ 16 O Exchange Experiment. -Bi2(GaxAl1-x)4O9, Bi2(FexAl1-x)4O9, and Bi2(FexGa1-x)4O9 (0 ≤ x ≤ 1) powders are prepared by dissolving the corresponding metal nitrate hydrates in glycerine, followed by gelation, calcination, and final heating at 800 °C for 24 h. The samples are characterized by powder XRD, IR spectroscopy, and 18 O/ 16 O isotope exchange experiments. All the compounds crystallize in the orthorhombic space group Pbam. The lattice parameters change linearly as a function of composition x. The oxygen tracer diffusion coefficients of Bi2Al4O9, Bi2Fe4O9, Bi2(Ga/Al)4O9, and Bi2Ga4O9 are estimated.