New quenched-in fluorite-type materials in the Bi{sub 2}O{sub 3}-La{sub 2}O{sub 3}-PbO system: Synthesis and complex phase behaviour up to 750 {sup o}C
- School of Biomedical, Biomolecular and Chemical Sciences, M313, The University of Western Australia, Crawley, WA 6009 (Australia)
- School of Chemistry, The University of Sydney, Sydney, NSW 2006 (Australia)
Research highlights: {yields} New quenched-in fluorite-type materials synthesised by solid state reaction. {yields} Compositions (BiO{sub 1.5}){sub 0.94-x}(LaO{sub 1.5}){sub 0.06}(PbO){sub x}, x = 0.02, 0.03, 0.04 and 0.05. {yields} Variable-temperature X-ray diffraction data collected in the range of 400-750 {sup o}C. {yields} Fluorite-type structure transforms during heating, complex phase behaviour characterised. {yields} Tetragonal, monoclinic, rhombohedral and bcc phases identified. -- Abstract: New quenched-in fluorite-type materials with composition (BiO{sub 1.5}){sub 0.94-x}(LaO{sub 1.5}){sub 0.06}(PbO){sub x}, x = 0.02, 0.03, 0.04 and 0.05, were synthesised by solid state reaction. The new materials undergo a number of phase transformations during heating between room temperature and 750 {sup o}C, as indicated by differential thermal analysis. Variable temperature X-ray diffraction performed on the material (BiO{sub 1.5}){sub 0.92}(LaO{sub 1.5}){sub 0.06}(PbO){sub 0.02} revealed that the quenched-in fcc fluorite-type material first undergoes a transformation to a {beta}-Bi{sub 2}O{sub 3}-type tetragonal phase around 400 {sup o}C. In the range 450-700 {sup o}C, {alpha}-Bi{sub 2}O{sub 3}-type monoclinic, Bi{sub 12}PbO{sub 19}-type bcc and {beta}{sub 1}/{beta}{sub 2}-type rhombohedral phases, and what appeared to be a {epsilon}-type monoclinic phase, were observed, before a single-phase fluorite-type material was regained at 750 {sup o}C.
- OSTI ID:
- 22210038
- Journal Information:
- Materials Research Bulletin, Vol. 46, Issue 4; Other Information: Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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