Metastable crystallization, phase partitioning, and grain growth of ZrO[sub 2]-Gd[sub 2]O[sub 3] materials processed from liquid precursors

Journal Article · Thu Oct 31 23:00:00 EST 1991 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1991.tb06844.x· OSTI ID:6838129

Leung, D K; Chan, C J; Ruhle, M; Lange, F F ^[1]

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1. Materials Dept., College of Engineering, Univ. of California, Santa Barbara, CA (United States)

This patent describes aqueous mixtures of Zr(C[sub 2]H[sub 3]O[sub 2])[sub 4] and Gd(NO[sub 3])[sub 3] used to prepare chemically homogeneous ZrO[sub 2]-GdO[sub 3] solid solutions containing 0 to 9 mol% Gd[sub 2]O[sub 3]. The application of kinetically limited equilibria concepts explains why a metastable tetragonal phase crystallized subsequent to precursor pyrolysis from compositions containing [lt]6.5 mol% Gd[sub 2]O[sub 3] and a metastable cubic phase crystallized from precursors with [gt]6.5 mol% Gd[sub 2]O[sub 3]. Partitioning experiments for a composition containing 3 mol% Gd[sub 2]O[sub 3] showed that the maximum equilibrium solid-solubility of Gd[sub 2]O[sub 3] in tetragonal ZrO[sub 2] is 1.0 [plus minus] 0.1 mol% and the minimum equilibrium solid-solubility in cubic ZrO[sub 2] is 8.0 [plus minus] 0.2 mol% at 1400[degrees].

• OSTI ID: 6838129
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 74:1; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
AQUEOUS SOLUTIONS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALLIZATION
DATA
DECOMPOSITION
DISPERSIONS
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
GRAIN ORIENTATION
INFORMATION
KINETICS
METASTABLE STATES
MICROSTRUCTURE
MIXTURES
NUMERICAL DATA
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHASE TRANSFORMATIONS
PRECURSOR
PYROLYSIS
RARE EARTH COMPOUNDS
REACTION KINETICS
SOLID SOLUTIONS
SOLUTIONS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TETRAGONAL LATTICES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES