Series of compositions Bi{sub 2}(M'{sub x}M{sub 1-x}){sub 4}O{sub 9} (M', M=Al, Ga, Fe; 0{<=}x{<=}1) with mullite-type crystal structure: Synthesis, characterization and {sup 18}O/{sup 16}O exchange experiment

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.07.019· OSTI ID:21494112

Debnath, T ^[1]; Ruescher, C H ^[1]; Fielitz, P; Ohmann, S; Borchardt, G ^[2]

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1. Institut fuer Mineralogie und Zentrum fuer Festkoerperchemie und neue Materialien (ZFM), Leibniz Universitaet Hannover, Callinstrasse 3, 30167 Hannover (Germany)
2. Institut fuer Metallurgie, Arbeitsgruppe Thermochemie und Mikrokinetik, TU Clausthal, Robert-Koch-Strasse 42, 38676 Clausthal-Zellerfeld (Germany)

Series of compositions Bi{sub 2}(M'{sub x}M{sub 1-x}){sub 4}O{sub 9} with x=0.0, 0.1,..., 1.0 and M'/M=Ga/Al, Fe/Al and Fe/Ga were synthesized by dissolving appropriate amounts of corresponding metal nitrate hydrates in glycerine, followed by gelation, calcination and final heating at 800 {sup o}C for 24 h. The new compositions with M'/M=Ga/Al form solid-solution series, which are isotypes to the two other series M'/M=Fe/Al and Fe/Ga. The XRD data analysis yielded in all cases a linear dependence of the lattice parameters related on x. Rietveld structure refinements of the XRD patterns of the new compounds, Bi{sub 2}(Ga{sub x}Al{sub 1-x}){sub 4}O{sub 9} reveal a preferential occupation of Ga in tetrahedral site (4 h). The IR absorption spectra measured between 50 and 4000 cm{sup -1} of all systems show systematic shifts in peak positions related to the degree of substitution. Samples treated in {sup 18}O{sub 2} atmosphere (16 h at 800 {sup o}C, 200 mbar, 95% {sup 18}O{sub 2}) for {sup 18}O/{sup 16}O isotope exchange experiments show a well-separated IR absorption peak related to the M-{sup 18}O{sub c}-M vibration, where O{sub c} denotes the common oxygen of two tetrahedral type MO{sub 4} units. The intensity ratio of M-{sup 18}O{sub c}/M-{sup 16}O{sub c} IR absorption peaks and the average crystal sizes were used to estimate the tracer diffusion coefficients of polycrystalline Bi{sub 2}Al{sub 4}O{sub 9} (D=2x10{sup -22} m{sup 2}s{sup -1}), Bi{sub 2}Fe{sub 4}O{sub 9} (D=5x10{sup -21} m{sup 2}s{sup -1}), Bi{sub 2}(Ga/Al){sub 4}O{sub 9} (D=2x10{sup -21} m{sup 2}s{sup -1}) and Bi{sub 2}Ga{sub 4}O{sub 9} (D=2x10{sup -20} m{sup 2}s{sup -1}). - Graphical abstract: Fig. Perspective view of the mullite-type Bi{sub 2}(M'{sub x}M{sub 1-x}){sub 4}O{sub 9} unit cell (M', M=Al, Ga, Fe). Display Omitted

• OSTI ID: 21494112
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 11; Other Information: DOI: 10.1016/j.jssc.2010.07.019; PII: S0022-4596(10)00301-4; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION
ABSORPTION SPECTRA
ALUMINIUM OXIDES
BISMUTH OXIDES
CALCINATION
CRYSTAL STRUCTURE
DATA ANALYSIS
GALLIUM OXIDES
HEATING
HYDRATES
INFRARED SPECTRA
IRON OXIDES
ISOTOPIC EXCHANGE
LATTICE PARAMETERS
MULLITE
NITRATES
OXYGEN 16
OXYGEN 18
POLYCRYSTALS
SOLID SOLUTIONS
SYNTHESIS
TEMPERATURE RANGE 1000-4000 K
X-RAY DIFFRACTION
ALUMINIUM COMPOUNDS
BISMUTH COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
CRYSTALS
DECOMPOSITION
DIFFRACTION
DISPERSIONS
EVEN-EVEN NUCLEI
GALLIUM COMPOUNDS
HOMOGENEOUS MIXTURES
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IRON COMPOUNDS
ISOTOPES
LIGHT NUCLEI
MATERIALS
MINERALS
MIXTURES
NITROGEN COMPOUNDS
NUCLEI
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PYROLYSIS
SCATTERING
SOLUTIONS
SORPTION
SPECTRA
STABLE ISOTOPES
TEMPERATURE RANGE
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS