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Influence of ZnO on Crystallization and Electrical Conductivity of Zinc Iron Phosphate Glasses

The purpose of the present study is to investigate influence of crystallization on conductivity of zinc iron phosphate glasses before and after heat treatments. The heat treatments were performed on the 10ZnO-30Fe2O3-60P2O5 (mol%) glass in several cycles at 600 and 650 °C. After each treatment the electrical conductivity was measured using impedance analyzer over wide frequency (0, 01 Hz – 4 MHz) and temperature range (303 - 473 K). The structure was analyzed by XRD, SEM and TEM. The XRD indicated crystalline growth with preferred orientation of the crystalline phase Fe3(P2O7)2 after heat treatments. Two semicircles in the complex impedance spectra, Z*(ω ), was observed as a result of the formation of the nanocrystals. Total electrical conductivity decreases after crystallization at 600 C for 1h, whereas increases after heat treatments at 650 °C. Significant increase in electrical conductivity is a result of conductivity through grain boundaries, i.e. interfaces between crystallites.

Crystallization; Zinc Iron Phosphate Glasses; Electrical Conductivity

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