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High temperature electrical properties of Sr- and Mg-Doped LaAlO3

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2019, 29(5), pp.187-191
  • DOI : 10.6111/JKCGCT.2019.29.5.187
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Received : August 15, 2019
  • Accepted : October 14, 2019
  • Published : October 31, 2019

Ji-young Park 1,  Hee Jung Park 2

1경북대학교
2단국대학교

Accredited

ABSTRACT

Perovskite-type oxides have consistently attracted considerable attention for their applications in high-temperature electrochemical devices, such as electrolytes and electrodes of solid oxide fuel cells, oxygen permeating membranes and sensors etc. Among them, the electrical conductivity of 10 % Sr and 10 % Mg doped LaAlO3 (LSAM9191) was measured using impedance spectroscopy and 4-probe d.c. method. Below 550°C, the grain boundary resistance mostly determined the overall conductivity; however, it nearly disappeared above 800°C. Using the defect model and curve fitting, the ionic and electronic conductivity contributions were also separated. In the temperature region where the sample resistance is mostly determined by the grain volume property, LSAM9191 was an oxygen ion conductor at low Po2 and a mixed conductor at high Po2. With increasing temperature, the ionic conduction region only slightly increased. Thus, LSAM9191 is a promising material as an oxygen ion conductor at high temperature and in low Po2.

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This paper was written with support from the National Research Foundation of Korea.
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