Fabrication of dense, shaped barium cerate by the oxidation of solid metal-bearing precursors
- Ohio State Univ., Columbus, OH (United States). Dept. of Materials Science and Engineering
Some rare-earth-doped alkaline-earth cerates (e.g., Nd{sub 2}O{sub 3}-doped BaCeO{sub 3}) are proton conductors that can act as solid-state electrolytes in hydrogen or steam sensors, hydrogen pumps, steam electrolyzers, and fuel cells. In the present study, dense tapes of neodymia-doped barium cerate were produced by the oxidation of malleable Ba-CeH{sub 3}-Nd{sub 2}O{sub 3} precursor tapes. Precursor tapes were produced by cold-rolling either blended or milled mixtures of Ba, CeH{sub 3}, and Nd{sub 2}O{sub 3} within a silver can. X-ray diffraction, electron microprobe analyses, and thermogravimetric analyses were used to study the phase transformations resulting from heat treatments conducted at 300 to 900 C in pure, flowing oxygen. Barium peroxide and cerium dioxide, produced during oxidation at {le}300 C, reacted at {ge}500 C to form barium cerate. The rate of formation of barium cerate depended on the degree of milling of the solid metal-bearing precursor powder. Dense barium cerate tapes were obtained after heat treatment at 1,080 C.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 271670
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 6 Vol. 79; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
40 CHEMISTRY
BARIUM
BARIUM OXIDES
CERIUM HYDRIDES
CERIUM OXIDES
DOPED MATERIALS
ELECTROLYTES
ELECTROLYTIC CELLS
ELECTRON MICROPROBE ANALYSIS
FABRICATION
HEAT TREATMENTS
NEODYMIUM OXIDES
OXIDATION
POWDERS
SILVER
SOLID ELECTROLYTE FUEL CELLS
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION