AC conductivity and dielectric behavior in mixed electronic-ionic 30Li2O–4MoO3–(66–x)TeO2–xV2O5 glass system
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Abstract
AC conductivity, dielectric property, and electric modulus formalism of lithium molybdenum tellurite glasses containing vanadium with compositions 30Li2O–4MoO3–(66–x)TeO2–xV2O5 (x = 0.2, 0.4, 0.6, 0.8, 1.0, and 1.2) have been studied in the frequency range 10−2 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 V2O5 showed a nonlinear increase for x ≤ 0.6 mol% before decreasing to a minimum at 0.8 mol% V2O5. The decrease in σ AC 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% V2O5, which was followed by a large increase at x > 0.8 mol%. The decrease at x = 0.8 mol% coincided with the σ AC 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.
Keywords
Glasses Dielectric properties Electrical conductivity Mixed ionic–electronic effectNotes
Acknowledgement
The project was financially supported by the Ministry of Higher Eduction of Malaysia and Research Management Centre (RMC), Universiti Teknologi Mara through the RAGS grant (No. RMI 600-RMI/RAGS 5/3 (141/2014)). The authors would like to express their gratitude to the Universiti Teknologi Mara and the Ministry of Higher Eduction of Malaysia for the SLAI scholarship given to Rosdiyana Hisam.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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