The calcia-zirconia phase diagram revisited; Stability of the ordered phases. phi. sub 1 and. phi. sub 2

Journal Article · Tue Jan 01 00:00:00 EST 1991 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1991.tb07325.x· OSTI ID:5193463

Dickerson, R M; Heuer, A H ^[1]

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1. Dept. of Materials Science and Engineering, Case Western Reserve Univ., Cleveland, OH (US)

Single crystals of CaO-stabilized ZrO{sub 2} containing between 15.3 and 18.9 mol% CaO were heat-treated for 5000 h at 1200{degrees}C to study the stability of the ordered defect-fluorite phase, CaZr{sub 4}O{sub 9} ({phi}{sub 1}). Subsequent TEM analysis of the equiaxed {phi}{sub 1} domains in samples richer than approximately 18 mol% in CaO showed a random distribution of {phi}{sub 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{degrees} to 1400{degrees}C and strongly suggests that {phi}{sub 1} is a stable phase in the ZrO{sub 2}-CaO systems.

• Sponsoring Organization: National Science Foundation (NSF); National Science Foundation, Washington, DC (United States)
• OSTI ID: 5193463
• Journal Information: Journal of the American Ceramic Society; (United States), Vol. 74:1; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM COMPOUNDS
CRYSTALS
HEAT TREATMENTS
PHASE DIAGRAMS
ZIRCONIUM OXIDES
DEFECTS
FLUORITE
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
DIAGRAMS
HALIDE MINERALS
MINERALS
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies