AC conductivity and dielectric behavior in mixed electronic-ionic 30LiO-4MoO-(66- x)TeO- xVO glass system.

AC conductivity, dielectric property, and electric modulus formalism of lithium molybdenum tellurite glasses containing vanadium with compositions 30LiO-4MoO-(66- x)TeO- xVO ( x = 0.2, 0.4, 0.6, 0.8, 1.0, and 1.2) have been studied in the frequency range 10 Hz to 1 MHz and temperature range 323-413 K to investigate the effects of mixed ionic-electronic carriers in the glasses. The variation of AC conductivity with VO showed a nonlinear increase for x ≤ 0.6 mol% before decreasing to a minimum at 0.8 mol% VO. The decrease in σ attributed to some forms of blocking effect on Li ions caused by the mixed ionic-electronic (MIE) effect. Meanwhile, dielectric constant showed a general increase for x ≤ 0.6 before an anomalous decrease at x = 0.8 mol% VO, which was followed by a large increase at x > 0.8 mol%. The decrease at x = 0.8 mol% coincided with the σ drop at the same location. This decrease was also suggested related to the MIE that induced a blocking effect, which caused the restricted dipole movement. [ABSTRACT FROM AUTHOR]

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