Investigation of Structural, Thermal, Electrical and Optical Properties of Sodium Doped Lanthanum Manganite.

Study of the La_1-xNa_xMnO₃ system has become very popular for its numerous industrial applications and research for device fabrication. In this study, La 0.85 Na_0.15 MnO₃ powder was made using the flux method incorporated with the conventional solid-state reaction technique. The synthesized crystalline powder and crystalline pellet were characterized for investigation of different properties. Highly ordered layered structure and higher order crystallinity for the cathode materials have been observed using XRD ensuring the better electrochemical performance of La 0.85Na_0.15MnO₃ crystal can be used as a novel electrode material for advanced energy conversion and storage battery devices. Completeness of phase formation with stability above 964°C has been observed from the thermal gravimetric analysis (TG-DTA). The structural and morphological confirmations have been reported using FTIR and SEM respectively. Higher optical absorbance in the ultra-violate and visible region with the energy band gap of 1.57eV has been estimated using UV-Vis spectroscopy can be very effective in photovoltaic devices and thus has initiated a possibility of use as a solar cell and photosensor device materials. The frequency-dependent AC conductivity, capacitance with Pico farad range, and low dielectric constant at high frequency have been observed using an impedance analyzer. All these properties nominate La 0.85 Na 0.15 MnO 3 crystal as a good candidate for various potential applications in energy storage systems, filtration purposes, motor starters, ultra-large-scale integration of integrated circuits, signal processing and microelectronic devices.

• Research Project