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The Svstern Zirconia‐Hafnia
Author(s) -
RUH ROBERT,
GARRETT H. J.,
DOMAGALA R. F.,
TALLAN N. M.
Publication year - 1968
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.1151-2916.1968.tb11822.x
Subject(s) - monoclinic crystal system , hafnia , tetragonal crystal system , materials science , diffraction , crystallography , cubic zirconia , x ray crystallography , microprobe , mineralogy , phase diagram , analytical chemistry (journal) , powder diffraction , phase (matter) , crystal structure , chemistry , metallurgy , optics , ceramic , physics , organic chemistry , chromatography
The ZrO 2 ‐HfO 2 system was investigated by metallo‐graphic, X‐ray diffraction, and microprobe analysis using are‐melted samples which had been annealed and quenched. The monoclinic‐tetragonal inversion was investigated by DTA and high‐temperature X‐ray diffraction analysis. Results reveal that zirconia and hafnia are completely miscible in all proportions in the binary system. Within experimental error, the melting points of the compositions lie roughly on a straight line connecting the melting points of oxides. There is a continuous increase in the monoclinic‐tetragonal inversion temperature as the composition moves from ZrO 2 to HfO 2 . The lattice parameters of the monoclinic phase follow smooth curves which have a negative deviation from Vegard's law.