Crystallization and Electrical Conductivity of Glasses of the Li2O–Al2O3–GeO2–CrO3–P2O5 System

The properties and local structure of lithium-aluminum-germanium phosphate glasses doped with of CrO₃ and prepared via melt quenching have been studied. The temperatures of glass transition, the onset and peak of crystallization, as well as the thermal stability of the glasses have increased with an increase in the content of the dopant. No significant change in the type of structural groupings over the entire considered range of concentration has been observed, which correlates with the absence of anomalous changes in the concentration dependencies of characteristic temperatures and conductivity of the glasses. Based on the XPS results, it has been shown that chromium has the oxidation state of +3 and +6 in the glasses. The conductivity of the glasses has increased slightly, and in the case of partially crystallized samples with the introduced additive content exceeding 5 mol %, the conductivity has increased by 3 orders of magnitude, the conductivity activation energy being decreased, is due to the formation of highly conductive crystalline phases.