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Site selectivity of iron doped in silica-bismuthate heavy metal glass systems

M. TODEA1,* , S. SIMON1, V. SIMON1

Affiliation

  1. Babes-Bolyai University, Faculty of Physics & Institute for Interdisciplinary Experimental Research, Cluj-Napoca, Romania

Abstract

Heavy metal glasses have attracted large interest due to their physical properties, such as high polarisability, long infrared cut-off or high non-linear optical susceptibility, optical transmission devices, ultrafast optical switches [1]. These properties can be influenced by doping with transition metal oxide.Fe3+ electron paramagnetic resonance (EPR) studies on iron doped silica-bismuthate glasses and glass ceramics were carried out in order to evidence the site selectivity of iron in the local structure of samples as the ratio between Bi2O3 and SiO2 content changes from 9/1 to 2/3. The environment of the resonant Fe3+ ions was investigated in vitreous and partially crystallised samples of similar composition. EPR data indicate that the iron dopant occupy equivalent sites in glasses, in the entire composition range, while in vitroceramic samples the iron is differently disposed in samples as Bi2O3/SiO2 ratio decreases. Structural changes induced by temperature rising in binary silico-bismuthate glasses are investigated by differential thermal analysis (DTA)..

Keywords

Heavy metal glasses, Glass-ceramic, EPR, DTA.

Submitted at: Nov. 1, 2008
Accepted at: Dec. 10, 2008

Citation

M. TODEA, S. SIMON, V. SIMON, Site selectivity of iron doped in silica-bismuthate heavy metal glass systems, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 12, pp. 3336-3340 (2008)