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Luminescence of modified nonbridging oxygen hole centers in silica and alkali silicate glasses

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Abstract

This paper reports on the results of the investigation of the cathodoluminescence spectra of silica and alkali silicate glasses upon excitation with a pulsed electron beam (energy, 180 keV; current density, 700 A/cm2; pulse duration, 2 ns). The luminescence band observed in the energy range 2.4–2.6 eV is assigned to modified structural defects of the ≡Si-O·/Me + type. These defects are revealed under high-density electronic excitation and, unlike the known L centers in alkali silicate glasses, are interpreted as a variety of nonbridging oxygen hole centers (defects of the dangling bond type) subjected to a disturbing action of the nearest neighbor alkali metal cations. The cathodoluminescence of similar centers is observed in neutron-irradiated silica glasses with lithium impurities; alkali silicate glasses with Li, Na, and K cations; and glasses in the two-alkali Na-K systems. It is established that the energy of the radiative transition of a modified nonbridging oxygen hole center, namely, ≡Si-O·/Me +, depends on the alkali cation type.

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Correspondence to V. B. Guseva.

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Original Russian Text © A.F. Zatsepin, V.B. Guseva, D.A. Zatsepin, 2008, published in Fizika i Khimiya Stekla.

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Zatsepin, A.F., Guseva, V.B. & Zatsepin, D.A. Luminescence of modified nonbridging oxygen hole centers in silica and alkali silicate glasses. Glass Phys Chem 34, 709–715 (2008). https://doi.org/10.1134/S1087659608060084

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  • DOI: https://doi.org/10.1134/S1087659608060084

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