J. Phys. III France
Volume 4, Numéro 5, May 1994
Page(s) 849 - 858
DOI: 10.1051/jp3:1994169
J. Phys. III France 4 (1994) 849-858

Some properties of Agl-Ag 2O-MoO 3 electrolyte doped with Al 2O 3

A. K. Arof1, E. B. Saniman2 and M. Z. Mastor2

1  Physics Division, Centre for Foundation Studies in Science, University of Malaya, 59100 Kuala Lumpur, Malaysia
2  Materials Science Programme, Faculty of Applied and Physical Sciences, National University of Malaysia, 43600 Bangi, Selangor Darul Ehsan, Malaysia

(Received 13 October 1993, revised 23 February 1994, accepted 24 February 1994)

Stoichiometric ratios of AgI, Ag 2O and MoO 3 were weighed into different crucibles. Different amounts of Al 2O 3 were added to all but one crucible so as to form the undoped ternary glassy 66.67 AgI-14.29 Ag 2O-19.04 MoO 3 system and the 66.67 Agl-14.29 Ag 2O-19.04 MoO 3 doped with 0.1, 0.3, 0.5, 0.7 weight % (w/o) of Al 2O 3 when the melts of these constituent chemicals were rapidly quenched in liquid nitrogen. The phases were characterized by XRD, electrical conductivity and transference number. The electrical conductivity at 300 K of the undoped glass is 0.003 S/cm and the doped sample with 0.5 w/o Al 2O 3 has the highest electrical conductivity at 300 K of 0.007 S/cm. These phases are solid electrolytes that were used to fabricate solid state electrochemical cells. The cell with the undoped electrolyte has an internal resistance of 150 $\Omega$ and the cell with the doped electrolyte (0.5 w/o Al 2O 3) has an internal resistance of 100 $\Omega$. The differences observed in the characteristics of the doped and undoped phases and the differences in the battery performance are attributed to the chemical reaction between Al 2O 3 and the glass which resulted in a change of the glassy phase in the doped material.

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