Electrochemical properties of a molten salt based on Bi2O3 with a MgO matri
x has been investigated. Melting temperature can be lowered by adding both
Li2O and Na2O, while the conductivity is not influenced by the ratio Li2O/N
a2O in the System (Bi2O3)(0.7)[(Li2O)(1-x)(Na2O)(x)](0.3). From the EMF mea
surements of the oxygen concentration cell, the molten salt is found to ope
rate as an oxide ion conductor. Although Bi2O3 is easily reduced in H-2 gas
atmosphere, it can be used at least down to 10(-4) atm of oxygen gas parti
al pressure. (C) 1998 Elsevier Science B.V. All rights reserved.