Thermal and electrical properties of mixed alkali in Li2O–Na2O–WO3–P2O5 glasses

Physical and optical studies in mixed alkali borate glasses with three types of alkali ions

“…The essential physical concept involved is that simultaneous migration of two unlike alkali ions in mixed ionic glass accompanied by an expansion or contraction of the guest occupied sites with distortion of the surrounding glass matrix [7].…”

Dielectric properties and scaling behavior of lithium tungsten phosphate glasses

“…It has also been reported that in some glasses containing both alkali metal cations and transition metal ions, electrical transport is mainly electronic since alkali metal cations have small mobility. [13,14,16]. The relation between the ac conductivity and the WO 3 concentration are represented in Fig.…”

“…. Bih et al [14] reported that in 0.25Li 2 O-0.75[x(MoO 3 )2 -(1-x)(P 2 O 5 )] glasses, Mo +5 /Mo tot and Mo +5 /Mo +6 ratios evaluated from the analysis of EPR spectra have shown the existence of maxima for x≈0. 27.…”

Mixed alkali effect in physical and optical properties of Li2O–Na2O–WO3–B2O3 glasses

“…Recently, Belostotsky [4] reported a new defect model for the mixed alkali effect. The essential physical concept involved is that simultaneous migration of two unlike alkali ions in mixed ionic glass is accompanied by an expansion or contraction of the guest-occupied sites with distortion of the surrounding glass matrix [5]. Far infrared spectroscopy has been employed to probe the effect of alkali mixing on the interactions between alkali ions and local sites in mixed alkali glasses [6,7].…”

“…To the best of our knowledge, there are no reports on mixed alkali borate tungsten glasses. A recent investigation of the electrical, glass transition temperature, and density properties in Li 2 O-Na 2 O-WO 3 (MoO 3 )-P 2 O 5 system showed the mixed alkali effect [5,45].…”