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The System Zirconia‐Scandia
Author(s) -
RUH ROBERT,
GARRETT H. J.,
DOMAGALA R. F.,
PATEL V. A.
Publication year - 1977
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.1151-2916.1977.tb15521.x
Subject(s) - monoclinic crystal system , tetragonal crystal system , eutectic system , phase (matter) , materials science , differential thermal analysis , crystallography , cubic zirconia , melting point , phase diagram , trigonal crystal system , analytical chemistry (journal) , diffraction , mineralogy , crystal structure , chemistry , microstructure , metallurgy , composite material , physics , optics , ceramic , organic chemistry , chromatography
The system zirconia‐scandia was investigated using X‐ray diffraction analysis, differential thermal analysis, metallographic analysis, and melting point studies. Results reveal the monoclinic α 1 phase (0 to 2 mol% Sc 2 O 3 ), the tetragonal α 2 ’phase (5 to 8% Sc 2 O 3 ), the rhombohedral β phase (9 to 13% Sc 2 O 3 ), the rhombohedral γ phase (15 to 23% Sc 2 O 3 ), the rhombohedral δ phase (24 to 40% Sc 2 O 3 ), and the cubic % phase (77.5 to 100% Sc 2 O 3 ). The monoclinic α 1 phase and the tetragonal α 2 ’phase were found to transform to the tetragonal α 2 phase over a wide temperature range depending on composition. The β, γ, and α phases transformed to a cubic phase at temperatures of %600 % , 1100 % , and 1300 % C, respectively. A maximum melting point of %2870 % C was found at %10% Sc 2 O 3 and a eutectic at %2400 % C at 55% Sc 2 O 3 .