ESR Study of Devitrification Processes |
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| Authors: | S ARAFA F ASSABGHY H FAHMY M ALLAM D SABEK |
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| Affiliation: | Solid State and Materials Research Center, The American University in Cairo, Egypt |
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| Abstract: | The radiation-induced ESR centers in glasses with different Ti concentrations were studied to elucidate crystallization processes in the glass. The parameters of the induced ESR absorption associated with the T 2 center were investigated systematically as a function of heat treatment. The induced T 2 centers in the glasses containing small concentrations of Ti characteristically decreased in intensity as nucleation began and disappeared completely in devitrified samples. A mechanism is proposed for the destruction of the T 2 center as nucleation proceeds to crystallization. Supporting X-ray diffraction evidence is given. The systematic decrease in the ESR intensity of this radiation-induced center provides a means of monitoring devitrification processes in glasses. |
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