Magnetic properties of some gadolinium silica glass ceramics

Glass-ceramics of 0.95SiO2-0.05Na2O composition containing up to 20% molar Gd2O3 were obtained by the sol-gel method and heat-treated at 250 deg C, 500 deg C and 1000 deg C. The samples were studied using scanning electron microscopy (SEM), electron paramagnetic resonance (EPR) and magnetic suscepti...

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Published in:Journal of Optoelectronics and Advanced Materials 2006-04, Vol.8 (2), p.526-528
Main Authors: Coroiu, I, Culea, E, Simiti, I Vida, Darabont, Al
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Culea, E
Simiti, I Vida
Darabont, Al
description Glass-ceramics of 0.95SiO2-0.05Na2O composition containing up to 20% molar Gd2O3 were obtained by the sol-gel method and heat-treated at 250 deg C, 500 deg C and 1000 deg C. The samples were studied using scanning electron microscopy (SEM), electron paramagnetic resonance (EPR) and magnetic susceptibility measurements. The electron micrographs show the modifications of the internal network structure of the studied samples with increasing the Gd2O3 concentration. The magnetic behavior of the xGd2O3 (1-x) (0.95SiO2 0.05Na2O) glass ceramics was assumed to be due to the presence of the Gd+ ions. The EPR spectra recorded for these samples consist of a single broad absorption signal with the effective g - value of 2. These spectra prove that the Gd+3 ions exist in the host glass ceramic matrix predominantly as clustered species. The inverse magnetic susceptibility as function of temperature for the xGd2O3 (1-x) (0.95S102 0.05Na2O) glass ceramics indicates that the susceptibility per mole of magnetic ion follows a Curie-Weiss type behavior. The obtained paramagnetic Curie temperature values suggest the presence of weak ferromagnetic interaction between the Gd+3 ions.
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The samples were studied using scanning electron microscopy (SEM), electron paramagnetic resonance (EPR) and magnetic susceptibility measurements. The electron micrographs show the modifications of the internal network structure of the studied samples with increasing the Gd2O3 concentration. The magnetic behavior of the xGd2O3 (1-x) (0.95SiO2 0.05Na2O) glass ceramics was assumed to be due to the presence of the Gd+ ions. The EPR spectra recorded for these samples consist of a single broad absorption signal with the effective g - value of 2. These spectra prove that the Gd+3 ions exist in the host glass ceramic matrix predominantly as clustered species. The inverse magnetic susceptibility as function of temperature for the xGd2O3 (1-x) (0.95S102 0.05Na2O) glass ceramics indicates that the susceptibility per mole of magnetic ion follows a Curie-Weiss type behavior. 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