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- W2142972661 abstract "Reduced perovskite-type compounds with compositions Na1−xSrxNbO3 (0.1≤x≤0.9) have been synthesized. X-ray powder diffraction (XRD) studies for the 0.2≤x≤0.7 phases indicate a tetragonal structure (P4/mbm) with unit-cell parameters a≈√2×aperc≈aper (the subscript ‘per’ refers to the cubic perovskite structure), and for x=0.8 and 0.9, the space group P4/mmm was found with a≈aper, c≈aper. Structure refinements based on XRD and neutron diffraction data using the Rietveld technique confirmed this for Na1−xSrxNbO3, 0.3≤x≤0.7 and x=0.5, 0.6, respectively. Selected-area and convergent beam electron diffraction studies show that the crystallites of x=0.2 and 0.3 phases in fact have the GdFeO3-type structure (space group Pnma and unit-cell parameters a≈√2×aper, b≈2×aper, c≈√2×aper) while crystallites in the 0.4≤x≤0.9 samples consist of intergrown domains between this orthorhombic structure and the tetragonal structure (P4/mbm). The reason for the appearance of two phases is due to local variations in the Na/Sr content within the crystallites. Measurements of the magnetic susceptibilities show that the itinerant behavior in the samples Na1−xSrxNbO3 increases with the carrier concentration. The resistivity measurements indicate that an insulator–metal transition takes place between x=0.5 and 0.6. The samples with x=0.4 and 0.5 exhibit a complex temperature dependence of the resistivity with a maximum around 70 K." @default.
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- W2142972661 date "2002-08-01" @default.
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- W2142972661 title "Structures and Properties of the Perovskite-Type Compounds Na1−xSrxNbO3 (0.1≤x≤0.9)—From Insulating to Metallic Conductivity" @default.
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- W2142972661 doi "https://doi.org/10.1006/jssc.2002.9603" @default.
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