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Stable and Metastable Phase Relationships in the System ZrO 2 –ErO 1.5
Author(s) -
Yashima Masatomo,
Ishizawa Nobuo,
Noma Tatsuo,
Yoshimura Masahiro
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb04052.x
Subject(s) - monoclinic crystal system , metastability , quenching (fluorescence) , tetragonal crystal system , phase (matter) , materials science , analytical chemistry (journal) , melting temperature , crystallography , homogeneous , thermodynamics , chemistry , crystal structure , physics , chromatography , quantum mechanics , composite material , fluorescence , organic chemistry
Stable and metastable phase relationships in the system ZrO 2 –ErO 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 1690°C or for 8 months at 1315°C. Two tetragonal phases ( t ‐ and t ′‐phases) were observed after quenching samples heated at 1690°C to a room temperature, whereas one t ‐phase and cubic ( c ‐) phase were found in those treated at 1315°C. Since the t ′‐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 1.5 at 1690°C and from 3 to 15 mol% ErO 1.5 at 1315°C. The equilibrium temperature T t‐m 0 between the t ‐ and monoclinic ( m ‐) phases estimated from A s and M s temperatures decreased with increasing ErO 1.5 contents.