Low-temperature sintering and phase changes in chromite interconnect materials

Conference · Sat May 01 04:00:00 EDT 1993

OSTI ID:10163758

Chick, L A; Armstrong, T R; McCready, D E; Coffey, G W; Maupin, G D; Bates, J L

Sintering shrinkage curves and phase changes were compared for calcium-substituted lanthanum chromates with either slight Asite enrichment or depletion. Of the former type, La{sub 0.7}Ca{sub 0.31},CrO{sub 3} that was synthesized by the glycine-nitrate method sintered to high density in air at 1250C, exhibiting two rapid-shrinkage events. Weight loss measurements corroborated XRD data showing that, prior to densiflcation, over half the Ca resided in non-perovskite phases, including CaCrO{sub 4}. In the La{sub 0.7}Ca{sub 0.31}CrO{sub 3}, densification was closely associated with re-dissolution of the Ca into the perovskite.

• Research Organization: Pacific Northwest Lab., Richland, WA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 10163758
• Report Number(s): PNL-SA--21622; CONF-9305100--1; ON: DE93015676
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
300503
36 MATERIALS SCIENCE
360202
CALCIUM OXIDES
CHROMIUM OXIDES
DENSITY
LANTHANUM OXIDES
MATERIALS, COMPONENTS, AND AUXILIARIES
PHASE STUDIES
SHRINKAGE
SINTERING
STRUCTURE AND PHASE STUDIES
X-RAY DIFFRACTION