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The Calcia–Zirconia Phase Diagram Revisited: Stability of the Ordered Phases φ 1 and φ 2
Author(s) -
Dickerson Robert M.,
Heuer Arthur H.
Publication year - 1991
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.1151-2916.1991.tb07325.x
Subject(s) - phase diagram , equiaxed crystals , materials science , cubic zirconia , phase (matter) , crystallography , diagram , fluorite , mineralogy , thermodynamics , chemistry , metallurgy , microstructure , ceramic , mathematics , physics , statistics , organic chemistry
Single crystals of CaO‐stabilized ZrO 2 containing between 15.3 and 18.9 mol% CaO were heat‐treated for 5000 h at 1200°C to study the stability of the ordered defect‐fluorite phase, CaZr 4 O 9 (φ 1 ). Subsequent TEM analysis of the equiaxed φ 1 domains in samples richer than approximately 18 mol% in CaO showed a random distribution of φ 1 variants, with no preferred interfacial habit planes. A critical review of the literature, combined with the new data, supports the Stubican‐Hellmann‐Hannon version of the phase diagram in the region 15 to 26 mol% CaO and 1000° to 1400°C and strongly suggests that φ 1 is a stable phase in the ZrO 2 ‐CaO systems.