Abstract
Abstract An EPR study of fast Na + ion vitreous conductors of the system B 2 O 3 −Na 2 O−Na 3 PO 4 has been carried out. After X-ray irradiation two types of paramagnetic centers have been observed. The first one is of boron-oxygen hole center (B.O.H.C.) type and similar to that earlier observed for other alkali borate glasses. The second one is of PO 4 2− type. A simulation of its spectrum has been achieved and a defect model discussed.
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