Solid-state phase relationships in the calcia-titania-zirconia system at 1200 C
- Lawrence Livermore National Lab., CA (United States)
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Geology and Geophysics
Phase relationships were investigated in the CaO-TiO{sub 2}-ZrO{sub 2} system at 1200 C for compositions containing <50 mol% CaO using X-ray diffraction and electron probe microanalysis. The existence of two previously reported ternary phases, zirconolite (CaZrTi{sub 2}O{sub 7}) and calzirtite (Ca{sub 2}Zr{sub 5}Ti{sub 2}O{sub 16}), was confirmed. Each of these phases exhibited a significant range of homogeneity between TiO{sub 2} and ZrO{sub 2}, while maintaining a nearly constant concentration of CaO. The ternary solubilities of the constituent binary phases were found to be small (typically <1 mol%), with the exceptions of the perovskites (CaTiO{sub 3} and CaZrO{sub 3}). These latter phases displayed mutual solubilities of at least 22 mol% but exhibited significant variations in composition from grain to grain. Thermodynamic equilibrium was clearly not established in several samples, although most of the phase relationship information obtained was self-consistent.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 316012
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 12 Vol. 81; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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