Informatics Publishing Limited

M. Mallahi ¹, V. Mazinani ¹, A. Shokuhfar ¹, M. R. Vaezi ¹

Affiliations
1 Mechanical Engineering Department, K. N. Toosi University of Technology, Tehran, IR

Abstract

Oxide ion conductors have been studied for many years because of their application in devices with high economical interest such as solid oxide fuel cells, oxygen sensors , dense ceramic membranes for oxygen separation. In this paper nanopowders were synthesized via sol gel method. The sintering temperature to complete phase transition are above 500°c. As-prepared yttria doped Bi₂O₃ nanocrystals were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). Transmission electron microscope (TEM) investigations revealed that the average particle size is less than 30 nm for these powders. It's worth noting that results show a good agreement of both methods. The morphology of the powders were observed on Field Emission scanning electron microscope (FESEM). Ionic conductivity measured by AC impedance spectroscopy.

Keywords

Nanopowders, Sol-Gel, Electron Microscopy, Impedance Spectroscopy, Substituted Bi₂O₃.

Full Text