Paramagnetic Chromium Centers in Y2SiO5 and Sc2SiO5 Crystals

The EPR spectrum of yttrium and scandium silicate single crystals doped with chromium has been studied at various frequencies. Y2SiO5 has one triclinic Cr3+ center, while the Sc2SiO5 crystals demonstrate two nonequivalent centers. The spin Hamiltonian parameters of these centers have been determined. These centers are found to be tricharged chromium ions localized in the yttrium and scandium positions.