Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-1429-C7-1434
Structural and high temperature electrical properties of Lay-xSrxMnO3 perovskite materialsE. SYSKAKIS, B. ROBENS and A. NAOUMIDIS
Research Centre Jülich, Institute for Reactor Materials, P.O. Box 1913, 5170 Jülich, Germany
The phase constitution of Lay-xSrxMnO3 perovskite materials with [MATH] and [MATH] prepared by wet chemical techniques has been determined. Single phase La-deficient materials have been obtained at y=0.95 and [MATH] as well as for [MATH] and [MATH]. The observed variation of the lattice parameters leads to shrinking unit cell volume with Sr-content and with La-deficiency. Small polaron conduction has been observed for [MATH], while for [MATH] metallic-like behaviour is observed for La-deficient materials. The electrical conductivity of Sr-free materials at 950 °C approaches 100 S/cm. The activation energy for conduction changes strongly with sintering temperature and composition of the specimen.
© EDP Sciences 1993