Li ion conduction in LiLnSiO(4) (Ln = La, Nd, Sm, Eu, Gd and Dy) sinters

Electrochemical properties of hexagonal lithium lanthanoid silicates were i nvestigated to confirm their lithium ion conduction at elevated temperature s. EMF of oxygen concentration cells using the specimen as an electrolyte o beyed Nernst's equation, indicating their unique ionic conduction. The char ge carrier for the ionic conduction was confirmed quantitatively to be lith ium ions by means of Tubandt's method. Partial substitution of alkaline ear th metals and lithium for lanthanum in LiLaSiO4 was found to be effective t o enhance conductivity and to improve sintering property. (C) 1998 Elsevier Science B.V. All rights reserved.