Abstract
The average distances between Gd3+ ions in multicomponent silicate glasses doped with 0.058 to up to 4.64 wt % Gd2O3 are characterized by electron paramagnetic resonance (EPR) line broadening effects at high-field (95 GHz, W band). Increase in the EPR resonant field/frequency above that of the conventional X band (9.5 GHz) simplifies the Gd3+ EPR spectra and increases the sensitivity of the EPR linewidth to concentration induced broadening effects. Least squares line shape simulations show that the broadening can be described by a Lorentzian function with a width proportional to the average Gd3+ concentration which is in good agreement with the existing theories. Analyses of the concentration dependence of Lorentzian line broadening indicate an onset of clustering of Gd3+ ions at > 1wt % doping levels.
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