title: Critical V2O5/TeO2 Ratio Inducing Abrupt Property Changes in Vanadium Tellurite Glasses.
abstract: Transition metal containing glasses have unique electrical properties and are therefore often used for electrochemical applications, such as in batteries. Among oxide glasses, vanadium tellurite glasses exhibit the highest electronic conductivity and thus the high potential for applications. In this work, we investigate how the dynamic and physical properties vary with composition in the vanadium tellurite system. The results show that there exists a critical V(2)O(5) concentration of 45 mol %, above which the local structure is subjected to a drastic change with increasing V(2)O(5), leading to abrupt changes in both hardness and liquid fragility. Electronic conductivity does not follow the expected correlation to the valence state of the vanadium as predicted by the Mott-Austin equation but shows a linear correlation to the mean distance between vanadium ions. These findings could contribute to designing optimum vanadium tellurite compositions for electrochemical devices. The work gives insight into the mechanism of electron conduction in the vanadium tellurite systems.
authors.affiliation: Section of Chemistry, Aalborg University , DK-9000 Aalborg, Denmark.
authors.forename: Jonas
authors.initials: J
authors.lastname: Kjeldsen
authors.affiliation: Department of Materials Engineering, Federal University of São Carlos , C.P. 676, 13565-905 São Carlos, SP, Brazil.
authors.forename: Ana C M
authors.initials: AC
authors.lastname: Rodrigues
authors.affiliation: Department of Chemistry, Technical University of Denmark , 2800 Kongens Lyngby, Denmark.
authors.forename: Susanne
authors.initials: S
authors.lastname: Mossin
authors.affiliation: Section of Chemistry, Aalborg University , DK-9000 Aalborg, Denmark.|State Key Laboratory of Silicate Materials for Architecture, Wuhan University of Technology , Wuhan 430070, China.
authors.forename: Yuanzheng
authors.initials: Y
authors.lastname: Yue