ALBERT

Description:    Gamma-irradiated alkali silicate glasses of the variable composition 22 x Na 2 O · 22(1 − x )K 2 O · 3CaO · 75SiO 2 have been studied using the electron paramagnetic resonance (EPR) method. It has been established that, upon the successive replacement Na → K in the two-alkali silicate glass, the EPR spectrum of hole centers on nonbridging oxygen atoms can be represented as a superposition of signals from the oxygen centers HC 1 (Na), HC 2 (Na), HC 1 (K), and HC 2 (K), which are characteristic of single-alkali silicate systems. The concentration dependences of hole and electron paramagnetic centers do not exhibit specific features that can be interpreted as a manifestation of the “mixed-alkali effect.” The results obtained have been discussed taking into account the extended model of centers on nonbridging oxygen atoms. Content Type Journal Article Category Dielectrics Pages 1776-1784 DOI 10.1134/S1063783412090326 Authors A. F. Zatsepin, Ural Federal University named after the First President of Russia B. N. Yeltsin (Ural State Technical University-UPI), ul. Mira 19, Yekaterinburg, 620002 Russia V. B. Guseva, Ural Federal University named after the First President of Russia B. N. Yeltsin (Ural State Technical University-UPI), ul. Mira 19, Yekaterinburg, 620002 Russia V. A. Vazhenin, Ural Federal University named after the First President of Russia B. N. Yeltsin (Ural State Technical University-UPI), ul. Mira 19, Yekaterinburg, 620002 Russia M. Yu. Artoymov, Ural Federal University named after the First President of Russia B. N. Yeltsin (Ural State Technical University-UPI), ul. Mira 19, Yekaterinburg, 620002 Russia Journal Physics of the Solid State Online ISSN 1090-6460 Print ISSN 1063-7834 Journal Volume Volume 54 Journal Issue Volume 54, Number 9