An outline of the crystal-structure of Bi2Mo2O9

Elzen, A.F. van den; Rieck, G. D.

doi:10.1016/0025-5408(75)90021-5

Cited by 43 publications

(19 citation statements)

References 2 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: 73%

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: 73%

Phase Composition and Charge Transport in Bismuth Molybdates

Hartmanová

Driessche

et al. 2005

Russ J Electrochem

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“…Once again, note that one large angle results from the steric e!ect of the two more distant (&&intermediate length'') Mo}O bonds and the remaining angles associated with the shorter bonds, as a consequence, compressed. Note also that these intermediate length bonds involve O [4] and O [5] and are thus in the basal plane. They result from the acentric positioning of the molybdenum in the +MoO , basal network.…”

Section: Temperature-dependent Studiesmentioning

confidence: 97%

“…,> layer being connected along b to the adjacent +MoO ,\ layers by oxygen O [1] and the other +Bi [1] O [3] ,> layer connecting via O [6] to the neighboring +MoO ,\ layers. The molybdenum has highly distorted octahedral coordination with four equatorial oxygen sites involving pairs of O [4] and O [5] and two apical oxygens (O [1] and O [6]). The MoO octahedra share corners along a and c to form an in"nite +MoO , L layer.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Incommensurate-to-Commensurate Phase Transition in the Bi2MoO6 Catalyst

Buttrey

Vogt

White

2000

Journal of Solid State Chemistry

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“…[11] Bismuth molybdate catalyst systems have been structurally characterized, [12] and studied extensively by different the thermo-Raman spectroscopy. Additionally, the dehydration resulting in formation of anhydrous techniques such as X-ray absorption, [13] X-ray diffraction, [14] neutron diffraction, [15] time-of-flight SIMS, [16] electron diffraction techniques, [17] high-resolution electron microscopy and vibrational spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Monitoring of α‐Bi₂Mo₃O₁₂ Catalyst Formation using Thermo‐Raman Spectroscopy

et al. 2004

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were observed during dehydration in the wavelength range from 200 to 1400 cm −1 . Representative Raman spectra of these compounds are reported for the first time. The thermo-Raman intensity thermogram showed a systematic dehydration in four steps, and the differential thermoRaman intensity thermogram confirmed this. Thermogravimetry, differential thermogravimetry, and differential scanning calorimetry results were in harmony with the results of

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An outline of the crystal-structure of Bi2Mo2O9

Cited by 43 publications

References 2 publications

Phase Composition and Charge Transport in Bismuth Molybdates

Phase Composition and Charge Transport in Bismuth Molybdates

High-Temperature Incommensurate-to-Commensurate Phase Transition in the Bi2MoO6 Catalyst

Synthesis and Monitoring of α‐Bi₂Mo₃O₁₂ Catalyst Formation using Thermo‐Raman Spectroscopy

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An outline of the crystal-structure of Bi2Mo2O9

Cited by 43 publications

References 2 publications

Phase Composition and Charge Transport in Bismuth Molybdates

Phase Composition and Charge Transport in Bismuth Molybdates

High-Temperature Incommensurate-to-Commensurate Phase Transition in the Bi2MoO6 Catalyst

Synthesis and Monitoring of α‐Bi2Mo3O12 Catalyst Formation using Thermo‐Raman Spectroscopy

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Synthesis and Monitoring of α‐Bi₂Mo₃O₁₂ Catalyst Formation using Thermo‐Raman Spectroscopy