Električni prijenos u molibdenovim i volframovim fosfatnim staklima

Renka, Sanja (2022) Električni prijenos u molibdenovim i volframovim fosfatnim staklima. Doctoral thesis, Institut Ruđer Bošković.

PDF - Published Version - other
Restricted to Closed Access until 16 December 2023.
Download (5MB) | Request a personal copy from author

Abstract

This doctoral thesis investigates changes in structural and electrical properties occurring upon the replacement of P2O5 by WO3 and MoO3 in binary and ternary phosphate glasses containing constant Li2O and Na2O content. Significantly higher electrical conductivity of WO3‒P2O5 in comparison to MoO3‒P2O5 glasses was ascribed to the clustering of WO6 octahedra in contrast to MoO6 and MoO4 polyhedra which interconnect uniformly with phosphate network. The role of terminal oxygen atoms in polaron conduction was established and shown to be a key parameter which governs the polaron transport. Glasses containing Li2O and Na2O exhibited mixed glass former effect in which the formation of mixed tungsten/molybdenum-phosphate units facilitates the long-range mobility of lithium and sodium ions. In glasses with Na2O, the maximum in DC conductivity was observed, while glasses with Li2O showed increase in the whole compositional range due to the smaller radius of lithium ions and hence their easier diffusion.

Item Type:

Thesis (Doctoral thesis)

Uncontrolled Keywords:

electrical properties ; mixed glass former effect ; phosphate glasses ; structure

Subjects:

NATURAL SCIENCES > Chemistry > Inorganic Chemistry

Divisions:

Division of Materials Chemistry

Projects: