Stable and metastable phase relationships in the system ZrO sub 2 -ErO sub 1. 5
- Research Lab. of Engineering Materials, Tokyo Inst. of Technology, Yokohama 227 (JP)
Stable and metastable phase relationships in the system ZrO{sub 2}-ErO{sub 1.5} were investigated using homogeneous samples prepared by rapid quenching of melts and by arc melting. The rapidly quenched samples were annealed in air for 48 h at 1680{degrees}C or for 8 months at 1315{degrees}C. Two tetragonal phases (t- and t{prime}-phases) were observed after quenching samples heated at 1690{degrees}C to a room temperature, whereas one t-phase and cubic (c-) phase were found in those treated at 1315{degrees}C. Since the t{prime}- phase is obtained through a diffusionless transformation during cooling from a high-temperature c-phase, t- and c- phases can coexist at high temperature. The t- and c-phases field spans from 4 to 10 mol% ErO{sub 1.5} at 1690{degrees}C and from 3 to 15 mol% ErO{sub 1.5} at 1315{degrees}C. The equilibrium temperature T{sub 0} {sup t{minus}m} between the t- and monoclinic (m-) phases estimated from A{sub s} and M{sub s} temperatures decreased with increasing ErO{sub 1.5} contents.
- OSTI ID:
- 5193459
- Journal Information:
- Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 74:3; ISSN JACTA; ISSN 0002-7820
- Country of Publication:
- United States
- Language:
- English
Similar Records
Phase equilibria in the system ZrO[sub 2]-InO[sub 1. 5]
High-temperature X-ray study of the cubic-tetragonal diffusionless phase transition in the ZrO[sub 2]-ErO[sub 1. 5]system: II, temperature dependences of oxygen ion displacement and lattice parameter of compositionally homogeneous 12 mol% ErO[sub 1. 5]-ZrO[sub 2]
Related Subjects
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALLOYS
CARBON ADDITIONS
CHALCOGENIDES
DIAGRAMS
ERBIUM COMPOUNDS
ERBIUM OXIDES
HIGH TEMPERATURE
IRON ALLOYS
MARTENSITE
MELTING
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
QUENCHING
RARE EARTH COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES