HYSCORE spectroscopy in the borate glasses

Glasses of the composition xB2O3–Li2O, with x=1, 2, 3, 4 and 5 were exposed to 60Co γ-irradiation and measured with hyperfine sublevel correlation (HYSCORE) spectroscopy. The HYSCORE spectra were explained with the assistance of a simulation procedure developed in-house in order to extract important parameters describing the Hamiltonian of the second boron neighbor of the paramagnetic state. HYSCORE spectroscopy in the xB2O3–Li2O glasses revealed Aiso couplings, the strength of which varies with x. In few cases, structural models could be proposed which may account for the HYSCORE spectra. The HYSCORE spectrum of the 4B2O3–Li2O glass exhibits cross peaks in both (+, +) and (+, −) quadrants indicating the presence of a complex structure.