Abstract
The ternary oxide system, Ln1−xSrxMnO3 (Ln=Pr, Nd, Sm, Gd, Yb and Y, with x ≤ 0.5), was synthesised by means of solid reaction at 1400°C. The phase composition and structure type of the reaction products were analysed by x-ray powder diffraction measurement. When Ln = Pr, Nd, Sm, or Gd, which have ionic radii greater than 1.0Å, Ln1−xSrxMnO3 exhibits an orthorhombic-perovskite structure of LaMnO3. When Ln = Yb or Y, which have ionic radii smaller than 0.95Å, the reaction products consist of (Yb,Y)MnO3 with a hexagonal structure and a second phase of Sr(Yb,Y)2O4. The electrical conductivities of the sintered samples were determined by a standard four probe technique. It was found that the conductivities of (Pr,Nd,Sm)1−xSrxMnO3 are approximately one order of magnitude higher than La1−xSrxMnO3 at high temperatures, and fully dense films, composed of the materials, were formed on a YSZ ceramic substrate by an appropriate procedure.
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