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Structural investigation of bismuth germanium system doped with gadolinium

D. A. UDVAR1,* , S. SIMON1

Affiliation

  1. Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu no 1,400084 Cluj-Napoca, Romania

Abstract

The local structure of the glasses and vitroceramics belonging to the 0.5Gd2O3·99.5 [xBi2O3 (1-x) GeO2] system, with 0.12<x<0.875 were studied by differential thermal analyses (DTA), X-ray diffraction (XRD) technique electron paramagnetic resonance (EPR) and infrared spectroscopy (IR). Differential thermal analyses were used in order to investigate the thermal behavior of the vitreous samples and to establish much appropriate the heat treatment temperature for obtaining vitroceramic samples. The crystalline phases developed in the glass matrix by heat treatment were identified by X-ray diffraction. Was identified five structural phases in heat-treated samples Bi2Ge4O11, Bi4Ge3O12, Bi2GeO5, Bi4GeO8 and Bi12GeO20. EPR data show that the Gd3+ ions are homogeneously distributed in the host matrices and the presence of small antiferromagnetic interactions between the Gd3+ ions. IR measurements show the presence of GeO4, GeO6, BiO6 and BiO4 structural units..

Keywords

Disordered system, EPR, IR, XRD, Local structure.

Submitted at: Nov. 15, 2006
Accepted at: March 15, 2007

Citation

D. A. UDVAR, S. SIMON, Structural investigation of bismuth germanium system doped with gadolinium, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 3, pp. 646-650 (2007)