Abstract
The electrical properties of xCr 2O 3–(40−x)Fe 2O 3–60P 2O 5, 0 ≤ x ≤ 10, (mol%) glasses have been investigated by impedance spectroscopy. In the glasses containing up to ~ 5 mol% Cr 2O 3, electrical conductivity increases due to the increase in the Fe 2+/Fe tot ratio. The conduction in these glasses is independent on Cr 2O 3 and it is controlled by the polaron hopping between iron ions. The electrical conductivity of the partially crystallized sample with 10 mol% Cr 2O 3 slightly increases although the Fe 2O 3 content and the fraction of Fe 2+ ions are smaller. This effect is related to the formation of highly disruptive regions around the β-CrPO 4 and Fe 3(P 2O 7) 2 crystallites in the glass matrix of this sample. These interconnected disruptive regions form the easy conductive pathways leading to a higher conductivity. Changes in the dielectric permittivity in chromium iron phosphate glasses are dependent on the Fe 2+/Fe tot ratio and, therefore, associated with the concentration of polarons related to Fe 2+ and Fe 3+ sites.
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