New quenched-in fluorite-type materials in the Bi2O3-La2O3-PbO system: Synthesis and complex phase behaviour up to 750 degrees C

作者：Webster Nathan A S^*; Hartlieb Karel J; Saines Paul J; Ling Chris D; Lincoln Frank J

来源：Materials Research Bulletin, 2011, 46(4): 538-542.

DOI：10.1016/j.materresbull.2010.12.035

• Ceramics
• Oxides
• X-ray diffraction
• Phase transitions

New quenched-in fluorite-type materials with composition (BiO1.5)(0.94-x)(LaO1.5)(0.06)(PbO)(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 degrees C, as indicated by differential thermal analysis. Variable temperature X-ray diffraction performed on the material (BiO1.5)(0.92)(LaO1.5)(0.06)(PbO)(0.02) revealed that the quenched-in fcc fluorite-type material first undergoes a transformation to a beta-Bi2O3-type tetragonal phase around 400 degrees C. In the range 450-700 degrees C, alpha-Bi2O3-type monoclinic, Bi12PbO19-type bcc and beta(1)/beta(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 degrees C.

• 出版日期2011-4
• 单位CSIRO