Sintering mechanisms and thermal expansion behavior for stoichiometric doped lanthanum chromites under reducing environment
- Central Research Inst. of Electric Power Industry, Yokosuka, Kanagawa (Japan). Chemical Energy Engineering Dept.
Sintering mechanisms and thermal expansion behavior of Mg, Ca or Sr doped LaCrO{sub 3} in a reducing environment have been investigated. In the case of Mg doped LaCrO{sub 3} under Ar-CO atmosphere, MgO particles are deposited in the grain-boundary during the sintering process, and then a solid state densification proceeds in the form of lanthanum chromite with a chromium deficit. For the Ca or Sr substitution, a liquid phase with a Ca or Sr-rich composition would percolate from the particles during the liquid phase sintering process. For all these materials, a difference of the thermal expansion coefficients between air and hydrogen was observed. Especially, after being measured in air, the thermal expansion slope showed a remarkable change during the first heating cycle under a hydrogen atmosphere. The temperatures were 465 C for the Ca-doped sample and 614 C for the Sr-doped one.
- OSTI ID:
- 242546
- Report Number(s):
- CONF-950683--; ISBN 1-56677-095-5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
ARGON
BATTERY SEPARATORS
CALCIUM OXIDES
CARBON MONOXIDE
CHROMIUM OXIDES
DOPED MATERIALS
EXPERIMENTAL DATA
LANTHANUM OXIDES
MAGNESIUM OXIDES
OXYGEN
PARTIAL PRESSURE
PHASE STUDIES
SINTERING
SOLID ELECTROLYTE FUEL CELLS
STRONTIUM OXIDES
THERMAL EXPANSION