Electron paramagnetic resonance and magnetic circular dichroism of Gd^{3 +} ions in oxyfluoride glass-ceramics containing CaF₂ nanocrystals

Magnetic resonance investigations of the Gd^{3 +} centre structure in the oxyfluoride glass and glass-ceramics (GCs) have been carried out. The electron paramagnetic resonance (EPR) measurements showed the presence of low symmetry Gd^{3 +} centres in the glass sample. The cubic Gd^{3 +} centre appeared in the glass-ceramics after heat treatment of the samples at temperatures above 650 C. The magnetic circular dichroism (MCD) measurements of both glass and glass-ceramics showedwide absorption band around 310 nm. In theGC samples MCD-EPR of the cubic Gd^{3 +} centre has been detected.