Abstract
In Be-doped MgO crystals a new V centre has been discovered whose physicalproperties differ significantly from those of other V centres. The centrecan be observed by means of EPR at room temperature; the shift of itsg-factorfrom the free electron value is about 1.6 times smaller than that of a VOHcentre, the optical absorption band is shifted by ∼1 eV to higher energies, and thethermal destruction of the centre through the loss of a hole takes place at about400 K. The axial symmetry of the centre and the hyperfine structure of itsEPR spectrum suggest the following model of the centre: Be2+–O−–vc–OH−.The specific physical properties of the VOH−Becentre are explained by an interaction of the effective electric dipole, created bythe off-centre position of the Be2+ ion substituting for the Mg2+, with the nearbylocalized hole.
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