Structure–polaronic conductivity relationship in vanadate–phosphate glasses
Marta Razum, Luka Pavić, Damir Pajić, Jana Pisk, Petr Mošner, Ladislav Koudelka, Ana Šantić
Abstract
Abstract This work provides new insights into the nature of the polaronic transport in x V 2 O 5 –(100− x )P 2 O 5 , 41 ≤ x ≤ 89 mol% glasses from analysis of their conductivity over a wide range of frequencies and temperatures, and correlation of the electrical parameters to the structural models of these materials. The results show that the linear increase in direct current (DC) conductivity with the increase in V 2 O 5 could be related to the formation of a vanadate subnetwork, which is characterized by a length distribution of V–O bonds and variations in linkages between different vanadate units. Such a structurally complex network offers multiple conduction pathways which are favorable for polaron hopping. The Summerfield scaling of conductivity spectra reveals a temperature‐invariant mechanism of polaron transport for all glasses and the same local structural environment of polarons at higher V 2 O 5 contents due to the same ratio of vanadate units present in the network. Also, this study highlights the similarities and differences in the nature of the polaronic transport of vanadate–phosphate glasses and other polaronically conducting phosphate glasses containing WO 3 , MoO 3, and Fe 2 O 3 , and pins down a pivotal role of the glass structure in electrical processes in these materials.