Gc. Kostogloudis et C. Ftikos, Effect of Sr-doping on the structural and electrical properties of gadolinium manganite oxide, J MATER SCI, 34(9), 1999, pp. 2169-2173
The crystal structure and electrical conductivity of the perovskite oxide s
ystem Gd1-xSrxMnO3+/-delta (x = 0-0.5) were investigated. The effect of the
level of Sr-doping on these properties was examined. An orthorhombic GdFeO
3-type structure (space group Pbnm) was found for all oxides. The room temp
erature lattice parameters were determined from the XRD data. A large disto
rtion of the unit cell was observed in the case of the undoped compound. Th
e distortion was gradually reduced with increasing Sr content. The unit cel
l volume decreased on Sr-doping. The electrical conductivity of the oxides
was measured from room temperature up to 800 degrees C. The small polaron h
opping conductivity model can adequately describe the electrical conductivi
ty behavior. The activation energy decreases as x increases. (C) 1999 Kluwe
r Academic Publishers.