ELECTRON-PARAMAGNETIC-RESONANCE SPECTRA OF GADOLINIUM(III) IONS IN LEAD ACETATE GLASSES

Electron Paramagnetic Resonance (EPR) studies have been made on lead a cetate glasses doped with Gd(III) ions on an X-band ESR spectrometer i n the temperature range 123 K to 423 K. The spectrum exhibits three fe atures with effective g-values of approximately 5.6, 2.83 and 2.02 and weaker features at g = 3.6 and 4.3. The spectra are similar to the '' U'' spectra familiar in many oxide and fluoride glasses, which confirm s once more that the rare-earth ions tend to impose their own environm ent when introduced into a glass. Remarkable changes have been observe d in the EPR spectrum, with changes in temperature, particularly at th e glass transition temperature (T(g) = 317 K).