Synthesis and electrical characterization of yttria-stabilized zirconia-titania solutions

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6109102

Liou, S S

Yttria-stabilized zirconia-titania solutions are novel mixed conductors in which both oxygen-ions and electrons are mobile. The electronic conductivity is established by the titania concentration, and the oxygen-ion conductivity is fixed by the yttria concentration. These oxide solutions have attractive applications as oxygen electrodes, catalysis materials and oxygen separation membranes. Single-phase oxide solutions in the ZrO{sub 2}-TiO{sub 2}-Y{sub 2}O{sub 3} ternary system have been prepared and characterized. Lattice parameter measurements indicate extensive solubility of titania in 10 and 12 mole % yttria-stabilized zirconia. The total electrical, the lattice and grain-boundary conductivities have been determined using impedance spectroscopy. Titania additions of 5, 7.5 and 10 mole percent were added to 10 and 12 mole percent yttria-stabilized zirconia. The yttria concentration was kept constant at either 10 or 12 mole % in the ternary-oxide solutions to fix the oxygen-vacancy concentration at 4.5 and 5.4 mole % respectively. Results were obtained at temperatures between 350 and 900{degree}C and at oxygen pressures between 0.21 and 10{sup {minus}23} atm. The electronic conductivity has been determined at temperatures between 800 and 950{degree}C using a platinum electrode to block the oxygen-ion conductivity. Electronic-transference numbers have been determined from both the electronic/total conductivity ratios and galvanic-cell measurements.

• Research Organization: Pennsylvania Univ., Philadelphia, PA (USA)
• OSTI ID: 6109102
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
CHALCOGENIDES
CHARGED PARTICLES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
GRAIN BOUNDARIES
IONIC CONDUCTIVITY
IONS
LEPTONS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
OXYGEN IONS
PHYSICAL PROPERTIES
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
USES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES