Lanthanum doped hybrid LaxBi2−xSn2O7/SnO2(β-Bi2O3) nanostructures for energy storage applications

Hybrid-phase metal oxides are known for immense and insistent daily life applications which makes them capable and competent for tremendous number of applications such as electrode material design, energy storage devices and fuel cells. In this context, a series of LaxBi2−xSn2O7/SnO2(β-Bi2O3) nanostructures is reported, synthesized preferably by using sol-gel technique. Lanthanum was replaced with bismuth with a doping concentration of (x = 0.0–1.0) with 0.2 step size and it was finely tuned within the lattice. Presence of hybrid phase metal oxides was confirmed after XRD analysis which was consistent with TEM results. These hybrid-phase metal oxides form heterojunction, working with multifunctional pyrochlore, which increases the dielectric constant and quantum efficiency of material. Electrical parameters like AC conductivity, impedance, dielectric constant, electric modulus and tangent loss were also studied via impedance analyzer meter at high frequencies (1 MHz–3 GHz). A detailed study of relaxation mechanisms was discussed showing the different polarization stages in applied frequency range. The appearance of relaxation peaks at different frequency exhibit high dielectric constant can make a prepared hybrid nanocomposites is suitable for energy storage devices for a wide range of frequency. •Lanthanum doped hybrid LaxBi2−xSn2O7/SnO2(β-Bi2O3) nanostructures were successfully synthesized by sol–gel method.•The effect of lanthanum doping on structural and dielectric properties was investigated.•The structural parameters such as lattice constant, crystallite size, lattice strain, micro-strain were determined.•Surface morphology and particle size distribution were studied using (TEM).•Frequency dependent dielectric, impedance, and electric modulus properties of the prepared materials were investigated in low and high frequency regions.