Materials Research Bulletin, Vol.37, No.14, 2335-2344, 2002
Formation, sintering, and electrical conductivity of (Nd1-xCax)CrO3 (0 <= x <= 0.25) using citric acid as a gelling agent
In Ca2+-substituted NdCrO3, single-phase perovskite compounds (Nd1-xCax)CrO3, where x = 0-0.25, have been formed by a citric acid processing. (Nd1-xCax)CrO3 powders consisting of submicrometer-size particles are sinterable; dense materials can be fabricated by sintering for 2 h at 1700degreesC under atmospheric pressure. The relative densities, grain sizes, and electrical conductivities increase with increased Ca2+ content. (Nd0.75Ca0.25)CrO3 materials show an excellent electrical conductivity of 1.9 x 10 S m(-1) at 1000degreesC. (C) 2002 Elsevier Science Ltd. All rights reserved.