A Review of Bismuth-Rich Binary Oxides in the Systems Bi2O3–Nb2O5, Bi2O3–Ta2O5, Bi2O3–MoO3, and Bi2O3–WO3

• Published in: Journal of solid state chemistry Vol. 137; no. 1; pp. 42 - 61
• Main Authors: Ling, Christopher D., Withers, Ray L., Schmid, Siegbert, Thompson, John G.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 01.04.1998; Elsevier
• Subjects: Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Inorganic compounds; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Water, oxides, hydroxides, peroxides; Phase diagrams; Commensurate phases; Inorganic compounds; Incommensurate phases; Electron diffraction; Modulated materials; Structure resolution; Transition element compounds; Tantalum oxides; Bismuth oxides; Binary systems; Tungsten oxides; XRD; Experimental study; Molybdenum oxides; Superstructure; Niobium oxides; Thermal annealing; Synchrotron radiation; Crystal structure
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1006/jssc.1997.7677

Bismuth-rich phases in the Bi2O3–Nb2O5, Bi2O3–Ta2O5, Bi2O3–MoO3and Bi2O3–WO3systems have been investigated using synchrotron X-ray diffraction (XRD) and electron diffraction (ED) to resolve outstanding problems concerning phase relationships, unit cells, and symmetry. A temperature-composition phase diagram for the Bi2O3–Nb2O5system is presented. Single-phase powder specimens have been prepared for most phases. A modulated structure approach has been applied to the characterization of phases, and space groups or superspace groups assigned. The most appropriate description (commensurate modulation, incommensurate modulation or superstructure) for the structure of each of the phases is discussed.