Phase relations at 1500 C in the ternary system ZrO{sub 2}-Y{sub 2}O{sub 3}-TiO{sub 2}

Journal Article · Mon Mar 01 04:00:00 EST 1999 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1998.8108· OSTI ID:338454

Feighery, A J; Irvine, J T.S.; Kaiser, A ^[1]; Fagg, D P ^[2]

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1. Univ. of St. Andrews, Fife (United Kingdom). School of Chemistry
2. Univ of St. Andrews, Fife (United Kingdom). School of Chemistry

Phase relations at 1500 C in the ternary system ZrO{sub 2}-Y{sub 2}O{sub 3}-TiO{sub 21} have been determined by powder X-ray diffraction of samples prepared by standard solid state mixing and also by ball milling. A large region of this ternary oxide system was shown to exhibit the defect cubic fluorite structure and to encompass compositions containing very high oxygen vacancy concentrations up to 16%, e.g., Zr{sub 0.21}Y{sub 0.62}Ti{sub 0.17}O{sub 1.69}. The authors have accurately determined the maximum extent of the defect fluorite phase, at low concentrations of yttrium/high concentrations of titanium. From previous studies this region of the solid solution is expected to yield compositions which exhibit the optimum mixed ionic and electronic conducting properties for electrochemical applications. The authors have determined that at 1500 C up to 18 atom% Ti{sup 4+} can be dissolved into ZrO{sub 2} stabilized in the cubic fluorite structure by the presence of 14 to 20 atom% Y. Trends in composition and unit cell parameter are discussed.

• OSTI ID: 338454
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 143; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
EXPERIMENTAL DATA
LATTICE PARAMETERS
PHASE DIAGRAMS
PHASE STUDIES
SOLID SOLUTIONS
TEMPERATURE RANGE 1000-4000 K
TITANIUM OXIDES
X-RAY DIFFRACTION
YTTRIUM OXIDES
ZIRCONIUM OXIDES