Effect of Al concentration on the holographic grating efficiency and ionic conductivity in sodium magnesium aluminosilicate glasses
| Autor: | Michael R. Hogsed, James P. Wicksted, George S. Dixon, J. J. Martin, Charles A. Hunt, Abdulatif Y. Hamad |
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| Rok vydání: | 2002 |
| Předmět: | |
| Zdroj: | Physical Review B. 65 |
| ISSN: | 1095-3795 0163-1829 |
| Popis: | A systematic study of grating formation, erasure, and decay in ${15\mathrm{N}\mathrm{a}}_{2}\mathrm{O}\ensuremath{\cdot}12\mathrm{MgO}\ensuremath{\cdot}x{\mathrm{Al}}_{2}{\mathrm{O}}_{3}\ensuremath{\cdot}(73\ensuremath{-}x){\mathrm{SiO}}_{2}$ glasses doped with 1.26 mol% ${\mathrm{Eu}}_{2}{\mathrm{O}}_{3}$ is reported as a function of ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ concentration for $x=0$ to 15. The permanent change in the index of refraction was a linearly increasing function of ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ concentration. The grating buildup and erasure rates also increased with ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ concentrations. This is attributed to the reduced activation energy for forced diffusion of small modifiers bound to ${\mathrm{AlO}}_{4}^{\ensuremath{-}}$ clusters rather than to nonbridging oxygens. Ionic conductivities were also measured to confirm the reduction of the activation energies. The results of this study support the model for grating kinetics in rare-earth sensitized glasses proposed recently by Dixon, Hamad, and Wicksted. |
| Databáze: | OpenAIRE |
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