Factors determining the crystal phases of zirconia powders: A new outlook

Journal Article · Thu Dec 31 23:00:00 EST 1992 · Chemistry of Materials; (United States)

DOI:https://doi.org/10.1021/cm00025a009· OSTI ID:6729623

Srinivasan, R; Davis, B J ^[1]; Hubbard, C R; Cavin, O B ^[2]

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1. Univ. of Kentucky, Lexington (United States)
2. Oak Ridge National Lab., TN (United States)

The pH of the supernatant liquid in contact with a zirconia precipitate and the time taken to effect precipitation can be used to prepare either the monoclinic or the tetragonal phase of zirconia following calcination at higher (>400[degrees]C) temperatures. Utilizing in situ X-ray diffraction, it has been observed that the precursors of either phase are first transformed to the tetragonal phase. The precursor that produces the monoclinic phase following heating to (about 450[degrees]C or higher) and then cooling in air initially forms an intermediate tetragonal phase. Mechanisms based upon solution chemistry that attempt to explain the formation of a precursor that leads directly to tetragonal zirconia or directly to monoclinic zirconia are unable to adequately account for the present results. 16 refs., 6 figs., 1 tab.

• OSTI ID: 6729623
• Journal Information: Chemistry of Materials; (United States), Journal Name: Chemistry of Materials; (United States) Vol. 5:1; ISSN CMATEX; ISSN 0897-4756
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CALCINATION
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DECOMPOSITION
DIFFRACTION
MONOCLINIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PHASE STUDIES
PHASE TRANSFORMATIONS
PYROLYSIS
SCATTERING
TETRAGONAL LATTICES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES