Synthesis, Characterization, Optical and Transport Properties of BaSnO 3 Synthesized by Wet Chemical Route

Abstract

Alkaline earth stannates have renewed attention as potential materials for gas sensing, transparent conducting oxides and ceramic capacitor applications. A noble wet chemical route is chosen to synthesize BaSnO3 powders having micron size grains. Problems related to uneven grains and poor densification in conventional solid state route have been overcome in the present method. X-ray diffraction data confirms the single phase formation without any secondary phase having cubic perovskite structure (S.G. Pm-3 m). The estimated lattice parameter is ≈4.11933 Ǻ and percentage density is ≈90%. The microstructure probed by scanning electron micrograph reveals almost homogeneously distributed particles having random shape with some porosity. Phonon modes in FT-IR and Raman spectra confirm the local symmetry distortion. The DC conductivity at 200˚C approaches almost 2 × 10−2 (Ω-cm)−1, which is almost of the same order as that observed ...