Structural and high temperature electrical properties of Lay-xSrxMnO3 perovskite materials

E. SYSKAKIS; B. ROBENS; A. NAOUMIDIS

doi:doi:10.1051/jp4:19937221

Numéro		J. Phys. IV France Volume 03, Numéro C7, Novembre 1993 The 3rd European Conference on Advanced Materials and Processes Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés


Page(s)		C7-1429 - C7-1434
DOI		https://doi.org/10.1051/jp4:19937221

The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés

J. Phys. IV France 03 (1993) C7-1429-C7-1434
DOI: 10.1051/jp4:19937221

Structural and high temperature electrical properties of La_y-xSr_xMnO₃ perovskite materials

E. SYSKAKIS, B. ROBENS and A. NAOUMIDIS

Research Centre Jülich, Institute for Reactor Materials, P.O. Box 1913, 5170 Jülich, Germany

Abstract
The phase constitution of La_y-xSr_xMnO₃ 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.