Electron Spin Resonance of V4+(VO2+) in Beryl

Abstract

Synthetic Australian Biron beryl coloured green by vanadium was irradiated with a dose of 10 kGy of 137Cs y rays. The reSUlting ESR spectrum has been modelled as being due to 12 equivalent V02+ centres, each arising from a complex formed from the substitution of V3+ in the beryl aluminium octahedral site, together with electron loss and motion towards a nearest neighbour oxygen. Each centre can be fitted to an axial spin Hamiltonian