Temperature-dependent dielectric measurements and structural properties of barium stannate (BaSnO3)

Cubic perovskite BaSnO3, synthesized by solid-state reaction method, was structurally characterized using temperature-dependent X-ray and Raman spectroscopy studies along with room temperature neutron diffraction analysis. Here, we report the effect of temperature on the structural parameters of BaSnO3 in correlation with dielectric properties. Sample homogeneity and elemental composition were studied by scanning electron microscopy and energy dispersive X-ray spectroscopy methods. The compound maintains cubic symmetry even at high temperatures and exhibits gradual increase in unit cell volume owing to thermal expansion. To understand high temperature phase transition, if any, and capacitance behavior, high temperature dielectric measurements were carried out. High value of dielectric constant was obtained at low frequencies as the temperature was increased, which may be due to the presence of oxygen vacancies or the lone-pair effect.(c) 2023 Published by Elsevier B.V.

Automated summary

Cubic perovskite BaSnO3 synthesized by solid-state reaction method was characterized using X-ray, Raman and neutron diffraction analysis to study the effect of temperature on its structural parameters and their correlation with dielectric properties. Sample homogeneity and elemental composition were examined using scanning electron microscopy and energy dispersive X-ray spectroscopy. The compound maintained cubic symmetry even at high temperatures and exhibited gradual increase in unit cell volume due to thermal expansion. High temperature dielectric measurements were conducted to understand high temperature phase transition and capacitance behavior, showing a high dielectric constant at low frequencies possibly due to the presence of oxygen vacancies or the lone-pair effect.