Structural and magnetic behaviour of some borate glasses containing dysprosium ions

Glasses of the xDy2O3(1−x)Na2B4O7 system with 0.01⩽x⩽0.15 were studied using IR spectroscopy, density and magnetic susceptibility measurements. IR spectroscopic and density data show that the dysprosium ions play a network modifier role in the studied glasses. Magnetic susceptibility data show a mictomagnetic type behaviour due to the presence of both isolated and exchange coupled Dy3+ ions.