Abstract
Valence states of the europium ion doped in barium octaborate, , were alternately changed between the trivalent and divalent ones by performing the crystallization or vitrification treatment for the host material in air at , and such valence change characteristics were discussed on the basis of the mutual transformation between and units and their connection manners via bridged oxygens in the networks of crystalline and vitreous forms, so that the redox mechanism proposed was applied to other metal borate host materials to predict and control the valence state of ions. ©1999 The Electrochemical Society
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