Ein „F-Zentrum” als paramagnetischer Donator in Zinkoxid

The ESR line atg?1.96 in zinc oxide single crystals has been reinvestigated. It is found that the defect responsible for the resonance can be described as anF-center, i.e., an electron trapped in an oxygen vacancy. TheF-centers act as donors and due to overlapping of their wave functions give rise to donor band conduction. This model has been confirmed by studying various methods to produce the centers and by ESR and conductivity measurements down to liquid helium temperature.