Electrical Conductivity of TiO2-V2O5-P205 Glasses |
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Authors: | HIROSHI HIRASHIMA ,KOTA NISHII,TETSURO YOSHIDA |
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Affiliation: | Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Japan |
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Abstract: | The dc conductivities (σ) of V2O5-P2O5 glasses containing up to 30 mol% TiO2 were measured at T=100° to ∼10°C below the glass-transition temperature. Dielectric constants from 30 to 106 Hz, densities, and the fraction of reduced V ion were measured at room temperature. The conduction mechanism was considered to be small polaron hopping between V ions, as previously reported for V2O5-P2O5 glass. The temperature dependence of σ was exponential with σ = σ0 exp(-W/kT ) in the high-temperature range. When part of the P2O5 was replaced by TiO2,σ increased and W decreased. The hopping energy depended on the reciprocal dielectric constant which, in this case, increased with increasing TiO2 content. |
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