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EPR studies on lanthanum aluminoborates doped with paramagnetic ions

S. SIMON1,*

Affiliation

  1. Faculty of Physics, Babes-Bolyai University, Cluj-Napoca, 400084, Romania

Abstract

Electron paramagnetic resonance was used to investigate the local structure around paramagnetic ions in amorphous and corresponding crystalline lanthanum alumino-borates of LaAl2B4O10.5 composition. In amorphous samples the EPR spectra are dominated by the features determined by a relative large distribution of the local structure parameters, while in crysta line counterparts this distribution is much narrow around specific values for certain sites. Three different sites for Fe3+ ions and only a preponderant one for Mn2+ and Gd3+ ions are identified in crysta line samples doped with paramagnetic ions. Iron and manganese ions are assumed to occupy the aluminium sites and gadolinium ions the lanthanum sites from LaAl2.03B4O10.54 phase..

Keywords

EPR, Lanthanum alumino-borates, Amorphous precursors.

Submitted at: Oct. 14, 2005
Accepted at: Jan. 26, 2006

Citation

S. SIMON, EPR studies on lanthanum aluminoborates doped with paramagnetic ions, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 1, pp. 99-101 (2006)