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We demonstrated crystal structures, magnetic, thermodynamic and optical properties of the B-site substituted perovskite oxides Ba2Pr(Bi1−x,Sbx) O6 (x=0, 0.1 and 0.2). Polycrystalline samples of Sb-substituted Ba2PrBiO6 were prepared with the conventional solid-state reaction technique. The X-ray diffraction data revealed that the polycrystalline samples are an almost single phase with a monoclinic structure (C2/m). Substitution of smaller Sb ion at Bi site causes a monotonic decrease in both the lattice parameters and volume. Magnetization measurements at high temperatures above 200 K show that the effective magnetic moment is estimated to be around 3.15 μB , which is close to that for Pr ion. The X-ray photoemission spectroscopy analysis revealed that a prominent peak of Pr is dominant with a smaller shoulder structure of Pr. A Schottky-like anomaly observed in the low-temperature specific heat measurement is explained by low-lying splitting of Pr ions under the crystal field effect. Optical spectra were measured using a diffuse-reflectance method. The band gaps were estimated from the optical data to be 0.977 eV and 1.073 eV, at x=0 and 0.2, respectively. The effect of band gap opening due to Sb substitution is examined by using the density functional theory.

Magnetic, thermodynamic and optical properties of Sb-substituted Ba2PrBiO6double perovskite oxides

Magnetic, thermodynamic and optical properties of Sb-substituted Ba₂PrBiO₆double perovskite oxides