Naslov
Electronic conductivity in zinc iron phosphate glasses

Autori
Ličina, Vesna ; Moguš-Milanković, Andrea ; Reis, Signo T. ; Day, Delbert E.

Izvornik
Journal of Non-Crystalline Solids (0022-3093) 353 (2007), 47-51; 4395-4399

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
phosphate glasses; electrical conductivity; scaling

Sažetak
The electrical properties of (40-x)ZnO-xFe2O3-60P2O5 (x = 10, 20, 30 mol%) glasses were measured by impedance spectroscopy in the frequency from 0.01 Hz to 4 MHz and the temperature range from 303 to 473 K. It was shown that the dc conductivity strongly depends on the Fe2O3 content and Fe(II)/Fetot ratio. The increase in dc conductivity for these glasses is attributed to the increase in Fe2O3 content from 10 to 30 mol%. With increasing Fe(II) ion content from 6 to 17 % the dc conductivity increases. This indicated that the conductivity arises mainly from polaron hopping between Fe(II) and Fe(III) ions suggesting an electron conduction in these glasses. By applying scaling on conductivity data measured at different temperatures, single master curve was obtained for each glass. On the other hand, deviation from the mater curve at high frequencies was observed for glasses with different composition. This deviation originates from a various mobility of charge carriers in different glass structure. Raman spectra showed the change of structure, from metaphosphate to pyrophosphate, with increasing Fe2O3 content from 10 to 30 mol%.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

Napomena
Dielectric Relaxation and Related Phenomena - Proceedings of the 4th Conference of the International Dielectric Society and the 9th International Conference on Dielectric and Related Phenomena, Poznan, Poland, 3-7 September 2006, Edited by Lidia Okrasa, Jacek Ulanski and Kia Ngai

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