Observation of Mixed Alkali Like Behaviour by Fluorine Ion in Mixed Alkali Oxyfluro Vanadate Glasses: Analysis from Conductivity Measurements

TL;DR

This study investigates fluorine ion behavior in mixed alkali oxyfluorovanadate glasses, revealing that fluorine ion dynamics exhibit a mixed alkali effect and significantly influence electrical conductivity.

Contribution

It provides new insights into fluorine ion dynamics and their mixed alkali behavior in oxyfluorovanadate glasses through conductivity measurements.

Findings

Room temperature conductivity drops by 5 orders of magnitude at 33 mol% rubidium.

Fluorine ion dynamics mimic the mixed alkali effect.

Conductivity scales with the onset frequency f0.

Abstract

In this communication we report the fluorine ion dynamics in mixed alkali oxyfluro vanadate glasses. We have measured the electrical conductivity using impedance spectroscopy technique Room temperature conductivity falls to 5 orders of magnitude from its single alkali values at 33 mol% of rubidium concentration. We have also estimated the distance between similar mobile ions using the density values. Assuming this distance as the hopping distance between the similar ions we have estimated the anionic (Fluorine ion in our case) conductivity. It is observed that the fluorine ion dynamics mimics the mixed alkali effect and scales as the onset frequency f0.