Diffusionless tetragonal-cubic transformation temperature in zirconia-ceria solid solutions
- Tokyo Inst. of Tech., Yokohama (Japan). Research Lab. of Engineering Materials
Diffusionless tetragonal (t[prime]) [leftrightarrow] cubic (c[prime]) phase transformation in 65-mol%-CeO[sub 2]-ZrO[sub 2] was investigated around the c[prime]-t[prime] equilibrium temperature T[sub 0][sup c[prime] [minus] t[prime]] using powder X-ray diffraction, where c[prime] was defined as a tetragonal or cubic phase with an axial ratio of unity. The (400) peak profile of t[prime]-ZrO[sub 2] broadened at 860 and 900 C. This indicated that the t[prime]-ZrO[sub 2] transformed partially into c[prime]-ZrO[sub 2]. The (400) peak profile of c[prime]-ZrO[sub 2] also broadened at 860 and 900 C, which indicated that the c[prime]-ZrO[sub 2] partially transformed to t[prime]-ZrO[sub 2]. The finish point of t[prime] [r arrow] c[prime] transformation T[sub f][sup t[prime] [r arrow] c[prime]] was investigated by annealing the t[prime]-ZrO[sub 2] containing 30--65 mol% CeO[sub 2] at various temperatures. The T[sub f][sup t[prime] [r arrow] c[prime]] line existed in the vicinity of the cubic solubility limit within the t + c two-phase region. This T[sub f][sup t[prime] [r arrow] c[prime]] location, which should have been located in the vicinity of T[sub 0][sup c[prime][minus]t[prime]], could not be explained by a simple regular solution model. However, it was described successfully by a thermodynamic model based on Landau's phenomenologic theory.
- OSTI ID:
- 5608221
- Journal Information:
- Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:11; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES