Abstract
The electron paramagnetic resonance (EPR) spectra of Gd3+ ions in lead germanate and lead phosphate glasses are analyzed as a function of Gd content and host composition in the temperature range between 4.2 and 300 K. The investigated samples were (40 − x)PbO·60GeO2· xGd2O3 (x = 0.25, 0.5, 1, 2, 3, 4 mol %) and 97.5Pb(PO3)2 · 2.5Gd(PO3)3 glasses, prepared by conventional melting technique. From comparison of spectra on different samples—some of which partially crystallized—no evidence emerges of the existence of distinct types of Gd3+ coordination environments. The analysis of the line-broadening by increasing the Gd3+ content evidences that the line width of the EPR signal components is proportional to the concentration of rare earth ions, suggesting that clustering effects are negligible, at least up to 4 mol % Gd2O3.
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