A DFT-based model to the interpretation of DC conductivity in transition metals doped zinc phosphate glass
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Date
2023
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Université de M'sila
Abstract
Ternary zinc–sodium–phosphate glasses doped with transition metal of the composition Na2MxZn1-x
P2O7(x = 0, 1, 2 and 5 mol %) (where M = Ni, Cu and Co) were prepared by the traditional quenching method. The ac
conductivity measurements at different temperatures for the prepared glasses have been investigated, and the activation
energy for dc conduction has been determined in each transition metal doped sample. The results showed that the evolution
of the activation energy of the conductivity depends on the nature of the dopant ions. A model based on formal density
functional theory concept in which the electrical charge exchanged between the transition-metal cations and the surrounding
material surface is proposed. The outcome is a ‘‘simplified’’ formula which allows us to explain the evolution of
the ionic dc conductivity activation energy as a function of the doped ion in interaction with the cation and the surface
Description
Keywords
Phosphate glass; Model; Conductivity; Transition metals; Density functional theory; Complex impedance spectroscopy