Study of Conduction Mechanisms in Alkali and Transition Metal Oxides Doped Borosilicate Glasses

Aravind Dyama; T Sankarappa; Mohansingh Heerasingh; Ashwini Devidas; Pallavi Jamadar; Amarkumar Malge

doi:10.17485/IJST/v17i17.412

Article

Study of Conduction Mechanisms in Alkali and Transition Metal Oxides Doped Borosilicate Glasses

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Indian Journal of Science and Technology

DOI: 10.17485/IJST/v17i17.412

Year: 2024, Volume: 17, Issue: 17, Pages: 1767-1775

Original Article

Study of Conduction Mechanisms in Alkali and Transition Metal Oxides Doped Borosilicate Glasses

Aravind Dyama¹, T Sankarappa^1*, Mohansingh Heerasingh¹, Ashwini Devidas¹, Pallavi Jamadar¹, Amarkumar Malge¹

¹Department of Physics, Gulbarga University, Kalaburagi, 585106, Karnataka, India

*Corresponding Author
Email: [email protected]

Received Date:14 February 2024, Accepted Date:27 March 2024, Published Date:23 April 2024

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

Objectives: To synthesise a unique set of borosilicate glasses of composition, xLi2O + 0.15SiO2 + 0.45B2O3 + 0.05ZnO + (0.35 – x) WO3; (0.25 ≤ x ≤ 0.34) and to investigate conduction mechanisms. Methods: Glasses were synthesized by melt quenching technique. From the XRD spectra samples were conformed to be non-crystalline in nature. Density has been measured by following Archimedes principle and is found to decrease with Li2O mole fractions in the range 2.900 gm/cm3 – 2.495 gm/cm3. DC-conductivity was measured for the temperature range 303K – 525 K using two probe technique. Findings: It was found that these glasses behave like semiconductors in terms conductivity variation with temperature. Conductivity decreased with Li2O content up to 0.33 mole fractions and increases for higher mole fractions. High temperature conductivity variation i.e., above ϴD/2 (ϴD = Debye’s temperature) is found to follow the Mott’s small polaron hopping (SPH) model. Activation energy for conduction above ϴD/2 is found to be in the range 0.282 eV-0.702 eV. Decrease of conductivity and activation energy with increase of Li2O content has been explained in terms of dynamic nature of network and formation of cation-polaron neutral entities. The conductivity below ϴD/2 has been found to follow Mott’s variable range hopping (VRH) models. The density of states at Fermi level derived from Mott’s VRH are found to be of the order of 1023 eV-1cm-3 which are in close agreement with reported ranges for transition metal oxides doped glasses. Novelty: A unique set of mixed conducting borosilicate glasses have been prepared and investigated thoroughly for conduction mechanisms.

Keywords: Borosilicate glasses, Density, Conductivity, Activation energy, Density of states

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Copyright

© 2024 Dyama et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Published By Indian Society for Education and Environment (iSee)