Hostname: page-component-586b7cd67f-gb8f7 Total loading time: 0 Render date: 2024-11-29T13:46:28.781Z Has data issue: false hasContentIssue false

Fluorite-related phases in the Bi-rich part of the Bi,Mo/O system

Published online by Cambridge University Press:  10 January 2013

G. Spinolo
Affiliation:
C.S.T.E./CNR, INCM, and Department of Physical Chemistry, University of Pavia, viale Taramelli 16, I27100 Pavia, Italy
C. Tomasi
Affiliation:
C.S.T.E./CNR, INCM, and Department of Physical Chemistry, University of Pavia, viale Taramelli 16, I27100 Pavia, Italy

Abstract

Two compounds with compositions around n=14 and n∼5.4 (n=Bi/Mo molar ratio) have been prepared by solid-state reaction with five heating/grinding cycles at 800 °C. The lattice constants of both compounds can be related to the fluorite-type structure of δ-Bi2O3. Bi14MoO24 has been indexed as an orthorhombic pseudotetragonal (√2×√2×1) superstructure: a=7.812 (±0.005) Å, b=7.762 (±0.005) Å, c=5.7716 (±0.0007) Å (but a+b=15.5750±0.0020). For orthorhombic (3×5×3) Bi38Mo7O78: a=16.8236 (±0.0027) Å, b=28.6182 (±0.0045) Å, c=16.9082 (±0.0027) Å.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1997

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Buttrey, D. J., Jefferson, D. A., and Thomas, J. M. (1986). “Characterization of a new Bismuth Molibdate Phase-Bi38Mo7O78,” Mater. Res. Bull. 21, 739744.Google Scholar
Chiodelli, G., Magistris, A., Spinolo, G., Tomasi, C., Antonucci, V., and Giordano, N. (1994). “Electrical properties in the Bi-rich part of the Bi,Mo/O system,” Solid State Ionics 74, 37–45.Google Scholar
Egashira, M., Matsuo, K., Kagawa, S., and Seiyama, T. (1979). “Phase Diagram of the System Bi2O3-MoO3,” J. Catal. 58, 409418.Google Scholar
Hardcastle, F. D., and Wachs, I. E. (1991). “Molecular Structure of Molibdenum Oxide in Bismuth Molibdates by Raman Spectroscopy,” J. Phys. Chem. 95, 1076310772.Google Scholar
Harwig, H. A. (1978). “On the Structure of Bismuthsesquioxide: the α, β, γ, and δ-Phase,”,” Z. Anorg. Allg. Chem. 444, 151166.Google Scholar
International Tables for X-ray Crystallography (1965). (Kynoch, Birmingham, UK).Google Scholar
Kohlmüller, R., and Badaud, J. (1969). “étude du système Bi2O3-MoO3,” Bull. Soc. Chim. Fr. 10, 3434–3439.Google Scholar
Spinolo, G., Anselmi-Tamburini, U. (1993). “On the least squares determination of lattice dimensions: a modified Singular Value Decomposition approach to ill-conditioned cases,” J. Appl. Crystallogr. 26, 58.Google Scholar
Takahashi, T., Esaka, T., and Iwahara, H. (1977). “Oxide ion conduction in the sintered oxides of MoO3-doped Bi2O3,” J. Appl. Electrochem. 7, 31–35.Google Scholar
Tu, Chen, and Smith, G. S. (1975). “The Compounds and the Phase Diagram of MoO3-Rich Bi2O3-MoO3 System,” J. Solid State Chem. 13, 288297.Google Scholar
Yvon, K., Jeitschko, W., and Parthé, E. (1977). “LAZY PULVERIX, a computer program for calculating X-ray and neutron diffraction powder patterns,” J. Appl. Crystallogr. 10, 7374.CrossRefGoogle Scholar