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Solid‐State Phase Relationships in the Calcia‐Titania‐Zirconia System at 1200°C
Author(s) -
Swenson Douglas,
Nieh TaiGang,
Fournelle John H.
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02763.x
Subject(s) - materials science , cubic zirconia , phase (matter) , ternary operation , ternary numeral system , zirconolite , electron probe microanalysis , microanalysis , ternary compound , analytical chemistry (journal) , homogeneity (statistics) , solubility , mineralogy , pyrochlore , electron microprobe , inorganic chemistry , chemistry , ceramic , metallurgy , statistics , mathematics , organic chemistry , chromatography , computer science , programming language
Phase relationships were investigated in the CaO–TiO 2 –ZrO 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 2 O 7 ) and calzirtite (Ca 2 Zr 5 Ti 2 O 16 ), was confirmed. Each of these phases exhibited a significant range of homogeneity between TiO 2 and ZrO 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 3 and CaZrO 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.