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Phase Equilibria in the System ZnO—TiO 2
Author(s) -
DULlN F. H.,
RASE D. E.
Publication year - 1960
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.1151-2916.1960.tb14326.x
Subject(s) - liquidus , rutile , eutectic system , materials science , sublimation (psychology) , volatilisation , hydrothermal circulation , mineralogy , phase (matter) , solid solution , analytical chemistry (journal) , chemical engineering , inorganic chemistry , metallurgy , chemistry , microstructure , alloy , psychology , organic chemistry , chromatography , engineering , psychotherapist
The system ZnO‐Ti0 2 has been investigated using quenching, hydrothermal, strip‐furnace, and solid‐state‐reaction techniques. Two compounds were found: Zn 2 Ti0 4 , which melts congruently at 1549 C., and ZnTiO 2 , which dissociates hydrothermally at 945° C. to give Zn 2 Ti0 4 and rutile. Two eutectics were found: one between ZnO and Zn 2 Ti0 4 at 32 mole % TiO, and 1537°C. and the other between Zn 2 TiO 4 and TiO 2 at 58 mole % TiO 2 and 1418°C. Rutile was the only modification of TiO 2 observed. The reported melting points of ZnO and TiO 2 are 1975° and 1830°C. respectively; however, data exist which indicate the sublimation of ZnO at atmospheric pressure. Loss of ZnO by volatilization slightly decreased the accuracy of the liquidus relations. Reported solid solutions of TiO 2 in Zn 2 Ti0 4 and ZnTiO 3 were not encountered, and explanations of this discrepancy are proposed.