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Conductivity of doped LaGaO3 prepared by citrate sol-gel method

I. STIJEPOVIC1,* , A. J. DARBANDI2,3, V. V. SRDIC1

Affiliation

  1. Department of Materials Engineering, Faculty of Technology, University of Novi Sad, Novi Sad, Serbia
  2. Structural Research Division, Technical University Darmstadt, Darmstadt, Germany
  3. Institute of Nanotechnology, Forschung Zentrum Karlsruhe, Karlsruhe, Germany

Abstract

Lanthanum-gallate powders (LSGM), with composition La1-xSrxGa1-yMgyO3-δ (0 ≤ x, y ≤ 0.2), were prepared using citrate solgel method. As-synthesized powders were calcined at 900°C, uniaxially pressed and sintered in air at different temperatures (up to 1450°C). Sintered samples contained cubic perovskite phase, while only pure LaGaO3 had small amount of the secondary orthorhombic phase. Sintering temperature of 1450°C with dwell time of 2 hours was sufficient to obtain samples with densities higher than 95% TD, with exception of pure LaGaO3. Impedance spectroscopy measurements confirmed that obtained LSGM ceramics have total conductivity an order of magnitude higher than zirconiabased electrolyte. Thus, citrate sol-gel method used in this work is a promising synthesis route for production of the doped lanthanum-gallate for intermediate temperature solid oxide fuel cells..

Keywords

Sol-gel processes, Ionic conductivity, Impedance, Perovskite, LSGM, LaGaO3.

Submitted at: March 28, 2010
Accepted at: May 26, 2010

Citation

I. STIJEPOVIC, A. J. DARBANDI, V. V. SRDIC, Conductivity of doped LaGaO3 prepared by citrate sol-gel method, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 5, pp. 1098-1104 (2010)