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Mixed Alkali Effect in Structural and Electrical Conductivity Properties of V2O5-, K2O- and Na2O-Containing Borate Glasses

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Abstract

Alkali borate glasses in the composition (Na2O)x − (V2O5)0.20 − (K2O)0.30−x − (B2O3)0.50 (0 ≤ x ≤ 0.30) have been investigated for density, structural and dc electrical conductivity properties. Melt-quenching technique has been employed to synthesize the present glass samples. Amorphous nature of the samples was confirmed by x-ray diffraction results. The variation in density and molar volume ranging up to x = 0.20 suggested the formation of non-bridging oxygen’s in the glass matrix. Further, Fourier Transform Infrared study confirmed the presence of [BO3] and [BO4] units placed at different structural groups. The composition dependent variation in peak positions of B–O–B bending and stretching of [BO3] and [BO4] units was observed to be non-linear. High-temperature dc electrical conductivity has been explained using Mott’s small polaron hopping theory. The electrical conductivity exhibited a dip and activation energy showed a peak at x = 0.20 mole, fraction of Na2O content suggested the occurrence of a mixed alkali effect. The low-temperature dc conductivity data has been analyzed using variable-range hopping theoretical models.

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Correspondence to M. Prashant Kumar.

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Banagar, A.V., Kumar, M.P., Sunanda, S. et al. Mixed Alkali Effect in Structural and Electrical Conductivity Properties of V2O5-, K2O- and Na2O-Containing Borate Glasses. Journal of Elec Materi 50, 4924–4932 (2021). https://doi.org/10.1007/s11664-021-09000-9

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