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Research Letters in Materials Science
Volume 2007 (2007), Article ID 97204, 5 pages
http://dx.doi.org/10.1155/2007/97204
Research Letter

Synthesis of β-Phase (Bi2O3)1-x (Dy2O3)x (0.01<x<0.10) System and Measurement of Oxygen Ionic Conductivity

1Department of Physics, Instute of Science, Gazi University, Ankara 06570 , Turkey
2Department of Chemistry, Faculty of Arts and Sciences, Erciyes University, Kayseri 38039, Turkey
3Department of Physics, Faculty of Arts and Sciences, Abant Izzet Baysal University, Bolu 14280, Turkey

Received 6 September 2007; Accepted 9 December 2007

Academic Editor: Robert S. Averback

Copyright © 2007 Serdar Yilmaz et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

β-phase (Bi2O3)1-x (Dy2O3)x system with tetragonal structure is synthesized for 0.01<x<0.10 molar doping. Unit cell parameters increased with increasing the doping. We have studied the dependence of total electrical conductvity on temperature, doping concentration of β-phase systems. The phase transition which manifests itself by the jump in the conductivity curve was also verified by DTA and both measurements are rather compatible. The electrical conductivity curves of β-phase structure revealed regular increase in the form of an Arrhenius curve. The activation energies are calculated from these graphs. Bi2O3-based Dy2O3 doped ceramics show ionic oxygen conductivity. The conductivity increased as the doping concentration increased. The highest value of conductivity is 0.006 0.006 ohm-1cm-1(600C) for the β-phase (Bi2O3)0.91 (Dy2O3)0.09(800C). The sample with the highest conductivity is (Bi2O3)0.91 (Dy2O3)0.09(800C) binary system where 1.450 ohm1cm1(745C).