Electronic and ionic conductivity studies on microwave synthesized glasses containing transition metal ions

Abstract

Please cite this article in press as: Sujatha B, et al. Electronic and ionic conductivity studies on microwave synthesized glasses containing transition metal ions. J Mater Res Technol. 2016. http://dx.

Novel insights into electrical transport mechanism in ionic‐polaronic glasses

“…On the other hand, glasses which exhibit significant contribution of polaronic conduction along with the ionic one show two semicircles in the impedance plot, Figure 5B. 22,[29][30][31][32][33] In our study we applied gold electrodes for electrical measurements which are blocking for ions and non-blocking for polarons. 22,[29][30][31][32][33] In our study we applied gold electrodes for electrical measurements which are blocking for ions and non-blocking for polarons.…”

“…Four series of glasses in the quaternary systems: 10,20,30,40,50, 60 (mol%) B) xWO 3 -(30À0.5x)Na 2 O-(30À0.5x)ZnO-40P 2 O 5 , with x = 0, 10, 20, 30, 40, 50, 60 (mol%) 10,20,30,40,50, 60 (mol%) 10, 20, 30, 40, 50, 60 (mol%).…”

“…Such a behavior is found to be typical for mixed conduction in various materials where selectively blocking electrodes (e.g., blocking for one carrier and non-blocking for the other one) are used. 22,[29][30][31][32][33] In our study we applied gold electrodes for electrical measurements which are blocking for ions and non-blocking for polarons. Therefore, the high frequency semicircle observed for Na-50W glass is associated with the dielectric relaxation of the bulk, whereas the additional semicircle at lower frequencies refers to a chemical relaxation due to unblocked polaronic diffusion.…”

Conductivity features of semiconducting tungsten‐phosphate glasses

“…Multicomponent glasses containing TMO (V 2 O 5 , Fe 2 O 3 , CuO, MoO 3 , WO 3 , etc), glass former (B 2 O 3 , P 2 O 5 , TeO 2 , etc), and alkali oxides as modifiers (Li 2 O, Na 2 O, etc) have been extensively reviewed . These glasses are known to be mixed ionic‐electronic conductors .…”

“…Multicomponent glasses containing TMO (V 2 O 5 , Fe 2 O 3 , CuO, MoO 3 , WO 3 , etc), glass former (B 2 O 3 , P 2 O 5 , TeO 2 , etc), and alkali oxides as modifiers (Li 2 O, Na 2 O, etc) have been extensively reviewed. [9][10][11][12] These glasses are known to be mixed ionic-electronic conductors. 10,11 It was found that alkali-free oxide glasses 13,14 in the TeO 2 -V 2 O 5 -MoO 3 and V 2 O 5 -Sb-TeO 2 systems 15 have nonohmic conduction leading to negative resistance/switching phenomenon at high electric fields.…”