Liquid-phase-assisted sintering of calcium-doped lanthanum chromites

Journal Article · Sun Feb 28 23:00:00 EST 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb03649.x· OSTI ID:6301929

Sakai, Natsuko; Kawada, Tatsuya; Yokokawa, Harumi; Dokiya, Masayuki; Kojima, Isao ^[1]

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1. National Chemical Lab. for Industry, Ibaraki (Japan)

Investigations have been made on the low-temperature sinterability of calcium-doped lanthanum chromites which are to be used as interconnectors in solid oxide fuel cells (SOFCs). Nominally chromium deficient lanthanum calcium chromites (La[sub 0.7]Ca[sub 0.3]Cr[sub 1[minus]y]O[sub 3], y = 0.02) were found to be sinterable to 94% theoretical density at 1573 K in air, whereas no densification was observed for samples with y = 0. The two-step shrinkage process suggests a liquid-phase sintering mechanism with calcium oxychromates playing an important role as the liquid phase. After sintering at 1573 K, calcium-rich substances remained at grain boundaries.

• OSTI ID: 6301929
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:3; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
300503 -- Fuel Cells-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALKALINE EARTH METALS
CALCIUM
CHALCOGENIDES
CHEMICAL COMPOSITION
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
CONDUCTOR DEVICES
CONNECTORS
DIRECT ENERGY CONVERTERS
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELEMENTS
EQUIPMENT
FABRICATION
FUEL CELLS
GRAIN BOUNDARIES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MATERIALS
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PHYSICAL PROPERTIES
POWDERS
RARE EARTH COMPOUNDS
SAMPLE PREPARATION
SINTERING
SIZE
SOLID ELECTROLYTE FUEL CELLS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
THERMAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS