Low-Temperature Sintering of La(Ca)CrO3 Powder Prepared through the Combustion Process
Ultrafine La(Ca)CrO3 (LCC) powder was prepared through the glycine–nitrate gel combustion process. It was shown for the first time that the use of relatively inexpensive CrO3 as a starting material for chromium has potential for the bulk preparation of sinter-active LCC powder. As-prepared powder, when calcined at 700°C, resulted in LCC along with a small amount of CaCrO4. The calcined powder was found to be composed of soft agglomerates with a particle size of ≈70–290 nm. The cold pressing and sintering of the calcined powder at 1200°C resulted in the mono-phasic La0.7Ca0.3CrO3 with density ≈98% of its theoretical value. This is the lowest sintering temperature ever reported for La0.7Ca0.3CrO3. The conductivity of the sintered La0.7Ca0.3CrO3 at 1000°C was found to be ≈57 S/cm in air. The sintering and electrical behavior achieved for La0.7Ca0.3CrO3 may find application as an interconnect material for high-temperature solid oxide fuel cells if problems with chemical expansion and poor conductivity in fuel can be overcome.
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Document Type: Research Article
Affiliations: 1: Applied Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India2:
Publication date: January 1, 2008