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Mixed polaronic-ionic conduction in lithium borate glasses and glass-ceramics containing copper oxide

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Abstract

The effect of electric field strength on conduction in lithium borate glasses doped with CuO with different concentration was studied and the value of the jump distance of charge carrier was calculated. The conductivity measurements indicate that the conduction is due to non-adiabatic hopping of polarons and the activation energies are found to be temperature and concentration dependent. Lithium borate glasses are subjected to carefully-programmed thermal treatments which cause the nucleation and growth of crystalline phases. X-ray diffraction analysis confirmed the amorphous nature for the investigated glass sample and the formation of crystalline phase for annealed samples at 650 °C. The main separated crystalline phase is Li2B8O13. The scanning electron micrographs of some selected glasses showed a significant change in the morphology of the films investigated due to heat treatment of the glass samples. It was found that the dc-conductivity decreases with an increase of the HT temperature. The decrease of dc conductivity, with an increase of the HT temperature, can be related to the decrease in the number of free ions in the glass matrix. There is deviation from linearity at high temperature regions in the logσ-1/T plots for all investigated doped samples at a certain temperature at which the transition from polaronic to ionic conduction occurs. The hopping of small polarons is dominant at low temperatures, whereas the hopping of Li+ ions dominates at high temperatures.

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  1. Radiation Physics Department, National Center for Radiation Research & Technology, Nasr City, Cairo, Egypt

    M.M.I. Khalil

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  1. M.M.I. Khalil
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Correspondence to M.M.I. Khalil.

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PACS

71.55.Jv; 72.60.+g; 72.80.Ng

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Khalil, M. Mixed polaronic-ionic conduction in lithium borate glasses and glass-ceramics containing copper oxide. Appl. Phys. A 86, 505–514 (2007). https://doi.org/10.1007/s00339-006-3802-y

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  • DOI: https://doi.org/10.1007/s00339-006-3802-y

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