engleski

DC conductivity and polarisation in iron phosphate glasses

Thermally stimulated polarization (TSPC) and depolarization current (TSDC) techniques were used to study polarization and conduction in the XFe2O3(100-X)P2O5, (14ŁxŁ47), glasses. TSDC peaks located between 196 and 262 K were attributed to the polarization caused by intrinsic dipolar defects. Electronic conductivity was analyzed in terms of small polaron hopping. DC conductivity depended upon the iron oxide content and the distance between iron ions. With increasing Fe2O3 content, there is a corresponding shortening of the distance between the iron ions and an increase in dc conductivity. The increase in conductivity and decrease in activation energy are related to the iron cluster formation in which charge transfer takes place along a chain of such clusters.

iron phosphate glasses ; electrical conductivity ; polarisation

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