Electrical properties of glasses in the Na2O-MoO3-P2O5 system

A range of coloured electronic or mixed ionic-electronic glasses has been e videnced in the Na2O-MoO3-P2O5 system. The properties of these glasses have been studied along different composition lines corresponding either to a f ixed Na2O content or a constant Mo/P ratio. An EPR spectroscopy investigati on of these glasses has allowed to determine the Mo5+ ion percentages in th ese materials. The electrical proper-ties of these glasses have been studie d by impedance spectroscopy, and the electronic and ionic contributions hav e been evaluated. The properties of these sodium glasses have been compared with those of lithium glasses with the same compositions. (C) 2001 Elsevie r Science B.V. All rights reserved.