Electrical Conduction in Nano-Structured La0.9Sr0.1Al0.85Co0.05Mg0.1O3 Perovskite Oxide

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Nanocrystalline La0.9Sr0.1Al0.85Co0.05Mg0.1O3 oxide powder was synthesized by a citrate–nitrate auto-ignition process and characterized by thermal analysis, X-ray diffraction, and impedance spectroscopy measurements. Nanocrystalline (50–100 nm) powder with perovskite structure could be produced at 900°C by this process. The powder could be sintered to a density more than 96% of the theoretical density at 1550°C. Impedance measurements on the sintered samples unequivocally established the potential of this process in developing nanostructured lanthanum aluminate-based oxides. The sintered La0.9Sr0.1Al0.85Co0.05Mg0.1O3 sample exhibited a conductivity of 2.40 × 10−2 S/cm in air at 1000°C compared with 4.9 × 10−3 S/cm exhibited by La0.9Sr0.1Al0.85Mg0.15O3.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2005.00369.x

Affiliations: Electroceramics Division, Central Glass and Ceramic Research Institute, Kolkata 700 032, India

Publication date: August 1, 2005

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