ELECTRON SPIN RESONANCE OF CR3+ IONS COUPLED WITH OXYGEN VACANCIES IN RUTILE

Paramagnetic resonance of Cr3+spins in TiO2single crystals were investigated in detail and two sets of weak absorption signals were observed in addition to usual Cr3+resonance lines. By analysing both the directions of the local symmetry axes and the magnitude of spin Hamiltonian parameters D and E of these two groups I and II, it is concluded that these resonances come from substitutional Cr3+spins coupled with the second and the third neighbor oxygen vacancies respectively. Spin Hamiltonian parameters determined for each group are given by Group I, g=1.98±0.005, D=5.10±0.10 GHz, E=-1.41±0.05 GHz Group II, g=1.98±0.005, D=-16.5±1.0 GHz, E=-3.9±0.5 GHz. © 1969, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.