Phase equilibria in the system HfO[sub 2]-Y[sub 2]O[sub 3]-CaO
Journal Article
·
· Journal of the American Ceramic Society; (United States)
- Inst. of Materials Science Problems, 252142 Kiev, Ukraine (USSR)
This paper reports on phase equilibria in the system HfO[sub 2]-Y[sub 2]O[sub 3]-CaO which were studied in the temperature range 1250[degrees] to 2850[degrees]C by both experimental methods (X-ray phase analysis at 20[degrees] to 2000[degrees]C, petrography, annealing and quenching, differential thermal analysis in He at temperatures to 2500[degrees]C, thermal analysis in air using a solar furnace at temperatures to 3000[degrees]C, and electron microprobe X-ray analysis) and theoretical means (development of a mathematical model for the liquidus surface by means of the reduced polynomial method). Phase equilibria were determined by the structure of the restricting binary systems. No ternary compounds were found. The liquidus was characterized by the presence of six four-phase, invariant equilibria. Solid solutions were based on monoclinic (M), tetragonal (T), and cubic (F) modifications of HfO[sub 2]; C and H forms of Y[sub 2]O[sub 3]; CaO; and CaHfO[sub 3] that crystallized in two polymorphous modifications, namely, the cubic and rhombic perovskite-type structure.
- OSTI ID:
- 7140237
- Journal Information:
- Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 75:11; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:230745
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Journal Article
·
Sat Dec 31 23:00:00 EST 1960
· Ogneupory (U.S.S.R.) For English translation see Refractories (USSR) (Engl. Transl.)
·
OSTI ID:4792892
ELECTRON-MICROSCOPIC AND THERMOGRAPHIC INVESTIGATION OF SOLID PHASE REACTIONS IN HfO$sub 2$-BaO, HfO$sub 2$-SrO, AND HfO$sub 2$-CaO
Journal Article
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OSTI ID:4821828
Related Subjects
36 MATERIALS SCIENCE
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& Refractories-- Structure & Phase Studies
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400101 -- Activation
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664400 -- Experimentally Derived Information on Atomic & Molecular Properties-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BINARY MIXTURES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
CRYSTAL STRUCTURE
DATA
DIAGRAMS
DISPERSIONS
ELECTRON MICROPROBE ANALYSIS
EXPERIMENTAL DATA
FUNCTIONS
HEAT TREATMENTS
INFORMATION
MATHEMATICAL MODELS
MICROANALYSIS
MICROSTRUCTURE
MINERALS
MIXTURES
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PEROVSKITE
PEROVSKITES
PHASE DIAGRAMS
PHYSICAL PROPERTIES
POLYNOMIALS
QUENCHING
SOLID SOLUTIONS
SOLUTIONS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
X-RAY EMISSION ANALYSIS
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360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
664400 -- Experimentally Derived Information on Atomic & Molecular Properties-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BINARY MIXTURES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
CRYSTAL STRUCTURE
DATA
DIAGRAMS
DISPERSIONS
ELECTRON MICROPROBE ANALYSIS
EXPERIMENTAL DATA
FUNCTIONS
HEAT TREATMENTS
INFORMATION
MATHEMATICAL MODELS
MICROANALYSIS
MICROSTRUCTURE
MINERALS
MIXTURES
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PEROVSKITE
PEROVSKITES
PHASE DIAGRAMS
PHYSICAL PROPERTIES
POLYNOMIALS
QUENCHING
SOLID SOLUTIONS
SOLUTIONS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
X-RAY EMISSION ANALYSIS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES