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Effect of microstructure on the conductivity of porous (La0.8Sr0.2)0.99MnO3

2009; Ceramic Society of Japan; Volume: 117; Issue: 1368 Linguagem: Inglês

10.2109/jcersj2.117.895

1882-0743

Sota Shimizu, Toshiaki Yamaguchi, Yoshinobu Fujishiro, Masanobu Awano,

Electronic and Structural Properties of Oxides

The relationship between microstructure and electrical conductivity of porous (La0.8Sr0.2)0.99MnO3 (LSM) ceramics were investigated. The porous LSM ceramics were prepared by sintering the cylindrically-extruded compacts at 1573 K for 6 h. The bulk density and porosity of LSM ceramics were measured by Archimedes technique. The electrical conductivities were measured using 4-probe DC technique as functions of temperature and bulk density. The open porosity was approximately proportional to the amount of binder in the LSM/water/binder mixture. The electrical conductivity decreased with decreasing bulk density, and the amount of decrease was more than predicted by the open porosity. This was related to the tortuosity of the carrier path.