Multifunctional Properties of (Sr,Mn)-Modified BaTiO3 Nanoceramics for Advanced Technologies

Chapter 11 investigates the complex impedance, dielectric, piezoelectric, ferroelectric, and electrochemical responses of Ba 1–x Sr x Ti 1–x Mn x O 3 (x = 0.0, 0.1) nanoparticles synthesized via the solid-state reaction route. XRD confirms phase-pure crystals with no satellite peaks, while vibrational spectroscopy shows TiO 6 octahedra formation. SEM images reveal inhomogeneous grain distribution and increased porosity. Impedance spectroscopy indicates non-Debye behaviour with no relaxation at room temperature, and ac conductivity follows Jonscher&s;s law. Dielectric studies show a Curie temperatures of ~400 K for pure BaTiO 3 and ~380 K for the x = 0.1 sample. The materials exhibit ferroelectricity, with well-defined P–E loops, and significant piezoelectric coefficients of 189 pC/N for pure BaTiO 3 and 56 pC/N for the x = 0.1 sample. Cyclic voltammetry reports a specific capacitance of 152.6 F g⁻¹ for the x = 0.1 doped sample, and EIS reveals diffusion-controlled charge transport with high charge transfer resistance. These results demonstrate the multifunctional potential of Sr,Mn-doped BaTiO 3 for advanced applications.