Synthesis, Characterization, Optical and Transport Properties of BaSnO<SUB>3</SUB> 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 BaSnO 3 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 in perovskite based electronic conductors. DC and a.c. electrical conductivity of the material follow Mott's variable range hopping at low temperature and Arrhenius type thermally activated process at elevated temperatures. Evidence of small polar on formation is also verified. Optical band gap estimated from absorption data is ≈2.94 very close to the reported value. Composition prepared through the noble wet chemical route has high electrical conduction and suitable for gas sensing applications.

The structural, electrical and optical properties of spark plasma sintered BaSn1-Sb O3 ceramics

“…Based on literature data BSO has a clear absorption edge at approximately 400 nm, corresponding to the band gap of 3.1 eV [2]. In our case, the undoped sample showed the absorption edge at lower energy and the band gap was 2.92 eV, which is in accordance with some previously reported results [28,50]. DRS of doped BaSn 1-x Sb x O 3 samples showed a reduction of slope, revealing that their absorption edge is moved to larger energies in comparison with BSO.…”

Synthesis, Characterization and Studies of Nanosized BaSnO3 and Its Poly (vinylalcohol) Nanocomposite Film

“…BaSnO3 material has lot of commercial demand due to its transport properties [20]. In addition, it is studied widely due to its potential applications in the field of sensors, photocatalyst and capacitors [21].…”

Influence of Zirconium (Zr4+) Substitution on the Crystal Structure and Optical and Dielectric Properties of Sr0.8Mg0.2(Sn1–xZrx)O3 Ceramics

“…However, the temperatures needed for these two alternate methods are 800 or 1000 °C, respectively. Low-temperature and quick synthesis methods are uncommon even with the numerous processes and characterizations of strontium stannate (SrSnO 3 ) that have been frequently investigated in the literature. − Long synthesis times are a feature of all of the ceramic routes for the stannates mentioned above (up to 16 h). As a result, it is clear that a more cost-effective, shorter-cycle, and lower-temperature synthesis process is required.…”

“…Semiconductor sensors (for humidity and gases), energy storage, and barrier layer capacitors have been reported as applications of stannates. − Stannate synthesis routes are especially interesting because of their importance. Stannates have already been successfully synthesized using a variety of techniques, i.e., high-temperature solid-state reactions of M­(NO 3 ) 2 /SnO 2 or MCO 3 /SnO 2 powder mixtures at different temperatures, i.e., 1000–1450 °C. − In addition to these ceramic preparation methods, those stannates can also be made by using sol–gel processes or by thermally decomposing oxalates . However, the temperatures needed for these two alternate methods are 800 or 1000 °C, respectively.…”