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Phase Equilibria and Ordering in the System ZrO 2 ‐Y 2 O 3
Author(s) -
STUBICAN V. S.,
HINK R. C.,
RAY S. P.
Publication year - 1978
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.1151-2916.1978.tb09220.x
Subject(s) - eutectic system , phase diagram , liquidus , isostructural , solid solution , fluorite , crystallography , hydrothermal circulation , materials science , analytical chemistry (journal) , phase (matter) , chemistry , mineralogy , crystal structure , metallurgy , microstructure , geology , organic chemistry , chromatography , seismology
The phase diagram for the system ZrO 2 ‐Y 2 O 3 was redetermined. The extent of the fluorite‐type ZrO 2 ‐Y z O 3 solid solution field was determined with a high‐temperature X‐ray furnace, precise lattice parameter measurements, and a hydrothermal technique. Long range ordering occurred at 40 mol% Y 2 O 3 and the corresponding ordered phase was Zr 3 Y 4 OL 12 . The compound has rhombohedra1 symmetry (space group R 3), is isostructural with UY 6 O l2 and decomposes above 1250±50°C. The results indicate that the eutectoid may occur at a temperature <400°C at a composition between 20 and 30 mol% Y 2 O 3 Determination of the liquidus line indicated a eutectic at 83± 1 mol% Y 2 O 3 and a peritectic at 76 ± 1 mol% Y 2 O 3 .