Phase equilibria and ordering in the system ZrO/sub 2/--Y/sub 2/O/sub 3/

Journal Article · Sun Jan 01 04:00:00 EST 1978 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1978.tb09220.x· OSTI ID:6427150

Stubican, V S; Hink, R C; Ray, S P

The phase diagram for the system ZrO/sub 2/--Y/sub 2/O/sub 3/ was redetermined. The extent of the fluorite-type ZrO/sub 2/--Y/sub 2/O/sub 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/sub 2/O/sub 3/ and the corresponding ordered phase was Zr/sub 3/Y/sub 4/O/sub 12/. The compound has rhombohedral symmetry (space group R3), is isostructural with UY/sub 6/O/sub 12/, and decomposes above 1250 +- 50/sup 0/C. The results indicate that the eutectoid may occur at a temperature <400/sup 0/C at a composition between 20 and 30 mol% Y/sub 2/O/sub 3/. Determination of the liquidus line indicated a eutectic at 83 +- 1 mol% Y/sub 2/O/sub 3/ and a peritectic at 76 +- 1 mol% Y/sub 2/O/sub 3/.

• Research Organization: Pennsylvania State Univ., Univ. Park
• OSTI ID: 6427150
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 61:1-2; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
&amp; Refractories-- Structure &amp; Phase Studies
CHALCOGENIDES
CRYSTAL STRUCTURE
DIAGRAMS
LATTICE PARAMETERS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES