Abstract

LOZANO ZAPATA, Carlos Alberto; PENA LARA, Diego  and  CORREA GALLEGO, Hernando. Variations in ß(T)-function due to addition of LiI-4AgI system. Univ. Sci. [online]. 2017, vol.22, n.2, pp.113-121. ISSN 0122-7483.  https://doi.org/10.11144/javeriana.sc22-2.vifd.

Impedance spectroscopy measurements of the LiI-4AgI samples, in the frequency range 20 Hz-1 MHz, and in the temperature range between 353 K and 378 K were made. Both pure and lithium-doped silver iodide showed blocking phenomena in the electrodes and the grain boundary. The blocking phenomena allowed a change in the transport properties of the pure compound in respect to the doped compound as the temperature varied. The curves of electrical modulus in the LiI-4AgI system show asymmetric peaks corresponding with a weak correlation between mobile ions in the diffusion process. The electrical conductivity in the Agl-Lil system can be described using a stretched relaxation function of the Kohlrausch-Williams-Watts (KWW) type. We speculat e that the phase of lithium dissolved in the silver iodide favors the formation of islands that disperses the conductivity due to the modification of the relationship among the microscopic energies: microscopic energy and migration energy.

Keywords : Electrical modulus; Ionic conductivity; Silver iodide; Lithium iodide; KWW function..

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