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Electrical and physicochemical properties of some Ag2O-containing lithia iron silica phosphate glasses

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Abstract

The present paper reports the influence of Ag2O addition at the expense of Li2O on the local structure of xAg2O·(30 − x)Li2O·10Fe2O3·10SiO2·50P2O5 glass matrix (with x = 0, 0.5, 1, 1.5 and 2 mol %). The phosphate structural units of the network former are assessed from Fourier transform infrared (FT-IR) spectroscopy. The addition of Ag2O to the glass network matrix ≤1 mol % leads to the occurrence of a depolymerization process of the phosphate structure and consequently, to the appearance of a distortion of the PO4 tetrahedra. When the content of Ag2O is increased from 1.5 up to 2 mol %, a remarkable polymerization process has been observed. The density, molar volume, microhardness and chemical durability have been investigated in order to study the effect of Ag2O/Li2O replacements on the physicochemical properties the studied glasses. The AC electrical properties are affected to a great extent with composition. These results are related to the internal structure of the glass samples. The conductivity, dielectric constant and dielectric loss of the studied glasses were studied using the frequency response in the interval 100 Hz–100 kHz and the effect of compositional changes on the measured properties was investigated. Measurements showed that the electrical responses of glass samples were different and complex for interpretation. The increase of Ag2O addition at the expense of Li2O contents (from 0 to 1 mol %) led to increase the conductivity, dielectric constant and dielectric losses of samples. The addition of more Ag2O at the expense of Li2O (from 1.5 to 2 mol %), resulting into decreasing the conductivity, the dielectric constant and dielectric losses of the studied glasses. The experimental data of the glass samples were argued to the internal structure of the glasses and the nature and role-played by weakening or increasing the rigidity of the structure of the sample. It could be concluded, therefore, that the AC electrical properties of the samples were influenced by the distribution of its constituents, connectivity, and number of free charges.

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Authors and Affiliations

  1. Glass Research Department, National Research Centre, Dokki, Cairo, Egypt

    S. Ibrahim & H. Darwish

  2. Geophysical Sciences Department, National Research Centre, Dokki, Cairo, Egypt

    M. M. Gomaa

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  1. S. Ibrahim
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Correspondence to H. Darwish.

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Ibrahim, S., Darwish, H. & Gomaa, M.M. Electrical and physicochemical properties of some Ag2O-containing lithia iron silica phosphate glasses. J Mater Sci: Mater Electron 23, 1131–1142 (2012). https://doi.org/10.1007/s10854-011-0561-0

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