The structure of γ-bismuth molybdate, Bi2MoO6, by powder neutron diffraction

Teller, Raymond G.; Brazdil, James F.; Grasselli, Robert K.; Jorgensen, J. D.

doi:10.1107/s0108270184010398

Cited by 65 publications

(43 citation statements)

References 7 publications

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“…The observed XRD reflections of the samples coincide with the reference data reported by the other authors, for instance [13][14][15] and can be ascribed to the following structures: α-Bi 2 Mo 3 O 12 (2/3) and β-Bi 2 Mo 2 O 9 (1/1) phases to the monoclinic structure and γ-Bi 2 MoO 6 (2/1) phase to the orthorhombic structure. A little amount of the "polluting" β-phase, detected by the d hkl = 3.227 and 2.821 Å reflections, was found in sample 2/1 (γ-phase).…”

Section: Crystallographic Structure and Phase Compositionsupporting

confidence: 74%

Phase Composition and Charge Transport in Bismuth Molybdates

Hartmanová

Driessche

et al. 2005

Russ J Electrochem

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The study of structural and electrical properties of three pure bismuth molybdate phases, α -Bi 2 Mo 3 O 12 , β -Bi 2 Mo 2 O 9 and γ -Bi 2 MoO 6 , prepared by the spray drying technique, is described and discussed. The structure of polycrystalline, layered samples investigated by means of XRD and Raman spectroscopy was found to be monoclinic for the α -and β -phases and orthorhombic for the γ -phase. The microstructure of the asprepared samples was not sufficiently developed under the given conditions of preparation, however, the thermal treatment can improve it. The high polarizability of Bi 3+ cations with their lone-pair electrons influences the stability of the disordered oxygen sublattice. All as-prepared phases undergo a slight structural change in the temperature region of 280-430°ë resulting in a decrease of the electrical conductivity probably due to an order disorder transition in the oxygen arrangement during the sample heating. The change of electrical conductivity observed was found to be reversible in the high-temperature region and irreversible in the lowtemperature one. The blocking of oxygen transport by the bismuth lone-pair electrons results in an increase of the activation energy and a decrease of the electrical conductivity in the high-temperature region. Relatively high relative dielectric permittivities ε r , 36-52, were observed in dependence on the investigated phase.

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Section: Crystallographic Structure and Phase Compositionsupporting

confidence: 74%

Phase Composition and Charge Transport in Bismuth Molybdates

Hartmanová

Driessche

et al. 2005

Russ J Electrochem

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“…The crystal lattice parameters calculated were as follows: a = 5.4326, b = 16.4302 and c = 5.4584 with a cell volume ca. to 487.21 for Bi 2 WO 6 [43], and a = 5.4822, b = 16.1986 and c = 5.5091 with a cell volume equal to 489.23 for Bi 2 MoO 6 [44]. After relaxation of the atomic positions, the Bi atom is coordinated with four O and four M atoms in all the three species.…”

Section: Geometrymentioning

confidence: 97%

DFT calculations on structural and electronic properties of Bi2MO6 (M = Cr, Mo, W)

et al. 2011

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The electronic structure calculations were performed based on DFT for photocatalyst Bi 2 MO 6 (M = Cr, Mo and W). The band-gap nature of Bi 2 MO 6 is direct, and band-gaps are 1.045, 1.98 and 2.3 eV or 1.245, 1.96 and 2.2 eV, corresponding to whether adopt the Bi 5d states or not. The valence and conduction bands in all the three systems are mostly composed of M nd, O 2p and Bi 6p orbitals. Bi 5d states widen the valence-bands and conduction-bands of Bi 2 MoO 6 and Bi 2 WO 6 . Bi 5d states of Bi 2 CrO 6 narrow the valence-band, but do not change its conduction-band. The covalent behavior of Bi-O and M-O bonds is obvious in the three relaxed systems according to bond order values. Mulliken population analyses reveal that from Bi 2 CrO 6 to Bi 2 WO 6 , the atomic populations of Bi increase while those of M decrease, showing the reduction in oxidative capability of Bi 2 MO 6 .

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“…The fuel to oxidant ratio was maintained as one to produce ignition of mixed precursors. [21] and [22] were used as a starting models for the refinement. Several our trials of refinement process showed that including of secondary Bi 2 O 3 phase into the refinement procedure improve the fit and residuals in comparison with the single-phase mode (Fig.…”

Section: Synthesis Of Bismuth Molybdatementioning

confidence: 99%

Synthesis, crystal structure and pseudocapacitor electrode properties of γ-Bi2MoO6 nanoplates

Senthilkumar

Selvan

Vasylechko

et al. 2014

Solid State Sciences

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. is analyzed by cyclic voltammetry and galvanostatic charge-discharge techniques. The effect of Na based aqueous electrolytes on capacitance of the Aurvillius type structured Bi 2 MoO 6 is investigated. As prepared γ-Bi 2 MoO 6 nanoplates provide the high specific capacitance (519 Fg -1 ) compared with the high-temperature monoclinic phase γ(H) Bi 2 MoO 6 in 1 M NaOH electrolyte. The obtained high specific capacitance of as prepared Bi 2 MoO 6 could be attributed to the decrease in particle size, increase in active sites, and nano plate-like structure of as prepared γ-Bi 2 MoO 6 .

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The structure of γ-bismuth molybdate, Bi2MoO6, by powder neutron diffraction

Cited by 65 publications

References 7 publications

Phase Composition and Charge Transport in Bismuth Molybdates

Phase Composition and Charge Transport in Bismuth Molybdates

DFT calculations on structural and electronic properties of Bi2MO6 (M = Cr, Mo, W)

Synthesis, crystal structure and pseudocapacitor electrode properties of γ-Bi2MoO6 nanoplates

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