J Mater Sci Technol ›› 1994, Vol. 10 ›› Issue (2): 97-106.

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EPR Study of Borax-glasses with Addition of Fe~(3+) Ions

M.Peteanu; L. Cociu and I. Ardelean (Dept. of Physics, University of Cluj-Napoca, Str. M.Kogalniceanu No. 1, 3400 Cluj-Napoca, Romania)(To whom correspondence should be addressed)   

  • Received:1994-03-28 Revised:1994-03-28 Online:1994-03-28 Published:2009-10-10

Abstract: Glasses of xFe2O3 (l-x) Na2B4O7 for 0.3≤x≤5 mol% have been studied by means of EPR. The distribution of Fe3+ ions in the vitreous network. as isolated and connected in clusters. depends on the impurity contents in the glass. A thermal treatment inducing the Fe3+ -rich phase separation ends at the sample crystallization, when performed at about 550℃, Weathering of glasses causes a Superficial alteration of their optical properties. It enters the bulk of the glass for powdered samples. As a result of gamma irradiation pararnagnetic hole centers were detected:the BOHC. the peroxy radical and the iron hole centers