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Phase composition and charge transport in bismuth molybdates

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Organization
Abstract
The study of structural and electrical properties of three pure bismuth molybdate phases, alpha-Bi2Mo3O12, beta-Bi2Mo2O9 and gamma-Bi2MoO6, 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 alpha- and beta-phases and orthorhombic for the gamma-phase. The microstructure of the as prepared samples was not sufficiently developed under the given conditions of preparation, however, the thermal treatment can improve it. The high polarizability of Bi3+ 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 degrees C 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 low-temperature 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 epsilon(r), 36-52, were observed in dependence on the investigated phase.

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Chicago
HARTMANOVA, M, MT LE, Isabel Van Driessche, Serge Hoste, and F KUNDRACIK. 2005. “Phase Composition and Charge Transport in Bismuth Molybdates.” Russian Journal of Electrochemistry 41 (5): 455–460.
APA
HARTMANOVA, M., LE, M., Van Driessche, I., Hoste, S., & KUNDRACIK, F. (2005). Phase composition and charge transport in bismuth molybdates. RUSSIAN JOURNAL OF ELECTROCHEMISTRY, 41(5), 455–460.
Vancouver
1.
HARTMANOVA M, LE M, Van Driessche I, Hoste S, KUNDRACIK F. Phase composition and charge transport in bismuth molybdates. RUSSIAN JOURNAL OF ELECTROCHEMISTRY. MAIK NAUKA/INTERPERIODICA; 2005;41(5):455–60.
MLA
HARTMANOVA, M, MT LE, Isabel Van Driessche, et al. “Phase Composition and Charge Transport in Bismuth Molybdates.” RUSSIAN JOURNAL OF ELECTROCHEMISTRY 41.5 (2005): 455–460. Print.
@article{332893,
  abstract     = {The study of structural and electrical properties of three pure bismuth molybdate phases, alpha-Bi2Mo3O12, beta-Bi2Mo2O9 and gamma-Bi2MoO6, 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 alpha- and beta-phases and orthorhombic for the gamma-phase. The microstructure of the as prepared samples was not sufficiently developed under the given conditions of preparation, however, the thermal treatment can improve it. The high polarizability of Bi3+ 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 degrees C 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 low-temperature 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 epsilon(r), 36-52, were observed in dependence on the investigated phase.},
  author       = {HARTMANOVA, M and LE, MT and Van Driessche, Isabel and Hoste, Serge and KUNDRACIK, F},
  issn         = {1023-1935},
  journal      = {RUSSIAN JOURNAL OF ELECTROCHEMISTRY},
  language     = {eng},
  number       = {5},
  pages        = {455--460},
  publisher    = {MAIK NAUKA/INTERPERIODICA},
  title        = {Phase composition and charge transport in bismuth molybdates},
  volume       = {41},
  year         = {2005},
}

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