Abstract
Use of the regular melting-quench method allowed the isolation of a small glass domain within the ternary system Li2O-P2O5-Cr2O3 at 1000°C. Electrical conductivity and dielectric permittivity measures on sample glasses and ceramic glasses of this domain were performed at a frequency of 10 kHz and at temperatures between 25°C and 300°C. The values of dielectric permittivity and electrical conductivity increase with increasing Li2O content. However, increases of Cr2O3 content, even at low concentrations, induce a change in electrical conductivity behaviour from that of a glass to that of a ceramic glass. The introduction of an increasing amount of Li2O content in vitreous phosphorus pentoxide changes its three-dimensional network; rupture of the P-O-P bond then occurs and there is formation of easily polarisable entities with quite high values of . The vibrational spectroscopy technique I.R has allowed an efficient investigation of the structural change versus composition within the above indicated ternary diagram. The maximal dielectric permittivity obtained at 300°C, both for the glasses and for the ceramic glasses varied in the order 104 to 3 × 105, while the maximum electrical conductivity obtained at 300°C for the ceramic glasses was in the order of 10-3 Ωcm-1.
Highlights
The maximal dielectric permittivity obtained at 300 ̊C, both for the glasses and for the ceramic glasses varied in the order 104 to 3 × 105, while the maximum electrical conductivity obtained at 300 ̊C for the ceramic glasses was in the order of 10−3 Ωcm−1
The regular melting-quench method allowed the isolation of a small vitreous domain within the ternary system Li2O-P2O5-Cr2O3 at 1000 ̊C
Conductivity measurements were realised on glasses and vitreous ceramics isolated within the ternary system Li2O-P2O5-Cr2O3
Summary
Aqdim et al 124 with oxides of phosphoric anhydrides [1] [2] [3] [4] Due to their low chemical durability, phosphate glasses have gained less attention. The electrical engineering field constitutes one of the numerous fields of application of glasses This field is interested in materials with high ionic conductivity that can be used as solid electrolytes, or in materials of very high resistivity capable of playing the dielectric role for miniaturised condensers. The study of the conduction mechanisms and their relation to the structure of the phosphorus network illustrate that with increased amounts of the modifier oxide Li2O in the glass network, the mobility of the Li+ carriers is facilitated, due to increased depolymerisation of the phosphate network [7] [18] [19]. The increasing glassy depolymerisation of the network induces an increase in the number of non-bridge oxygens and an increase in the dielectric permittivity [7] [18] [20] [21]
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