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FAST ION CONDUCTION IN SILVER MOLYBDENUM PHOSPHATE GLASSES

A. Latia1,* , C. Vancea1

Affiliation

  1. Politehnica” University of Timisoara, Faculty of Industrial Chemistry, Department of Science and Engineering of Oxidic Materials, Timisoara, Romania

Abstract

Investigation of the transport phenomena in silver molybdenum phosphate glasses has revealed that the observed fast ionic transport is due to silver ions. The structure of these glasses, investigated using infrared spectra, shows that MoO3 and P2O5 are the glass formers, the role of the last one being more important as the MoO3 content decreases. The densities of the glasses, measured using the displacement method show that the addition of Ag2O to the binary MoO3-P2O5 system causes a constant increase in the density of the glasses. AC conductivity measurements of the glasses were conducted in open atmosphere from 5 Hz to 100 kHz by use of a HP 4142 impedance-meter in the temperature range of 303 - 423 K. The glasses exhibited high ion conductivities in the range of 10-4 to 10-1 Sm-1 at room temperature. The conductivities of the glasses increase and the activation energies of the conduction process decrease with the Ag2O content. The total conductivity of the glasses was recorded using the two electrodes method. The investigated glasses have a very similar behavior in direct and alternative current, respectively, the activation energies being close. The obtained values for the transport number, very close to unity, shows that the Ag+ ions are the charge carriers in these glasses, the contribution of the electronic conductivity being negligible..

Keywords

Superionic glass, Solid state ionics, Glass structure.

Submitted at: Aug. 2, 2002
Accepted at: March 12, 2003

Citation

A. Latia, C. Vancea, FAST ION CONDUCTION IN SILVER MOLYBDENUM PHOSPHATE GLASSES, Journal of Optoelectronics and Advanced Materials Vol. 5, Iss. 1, pp. 185-190 (2003)