Zirconia-ceria solid solution synthesis and the temperature-time-transformation diagram for the 1:1 composition

Journal Article · Thu Jul 01 00:00:00 EDT 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb06643.x· OSTI ID:6135476

Yashima, Masatomo; Morimoto, Kenji; Ishizawa, Nobuo; Yoshimura, Masahiro ^[1]

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1. Tokyo Inst. of Tech., Yokohama (Japan). Research Lab. of Engineering Materials

Zirconia-ceria solid solutions of tetragonal symmetry (t[prime]-ZrO[sub 2]) containing 30 to 65 mol% ceria were prepared by annealing c[prime]-ZrO[sub 2] at 627C samples sintered at 1,660-1,760C, where c[prime]-ZrO[sub 2] is defined as a cubic or tetragonal phase whose axial ratio c/a (tetragonality) is equal to 1. The lattice parameters and the cube root of the unit cell volumes of the annealed samples increased linearly with the ceria content but, on the other hand, the axial ratio c/a (tetragonality) decreased to 1.000 at 70 mol%. During the annealing of each sample, the cell volume decreased because the residual Ce[sup 3+] ions were oxidized to the smaller Ce[sup 4+]. The temperature-time-transformation (TTT) diagram of the 1:1 solid solution was investigated for the c[prime] [minus] t[prime] diffusionless phase transition and the c[prime][minus] (t + c) diffusional reaction. The c[prime] [minus] t[prime] transformation was found to behave as a thermally activated process with an activation energy estimated to be 113 kJ/mol. This value may indicate that c[prime] [minus] t[prime] transformation is controlled by oxygen diffusion accompanied by dimensional changes of the cerium ions.

• OSTI ID: 6135476
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:7; 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
ANNEALING
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
DATA
DIAGRAMS
DIFFRACTION
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
FABRICATION
HEAT TREATMENTS
INFORMATION
LATTICE PARAMETERS
MIXTURES
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
RARE EARTH COMPOUNDS
SCATTERING
SINTERING
SOLID SOLUTIONS
SOLUTIONS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES