^aResearch Department of Physics, V.O.Chidambaram College, Thoothukudi-

628008, Tamilnadu, India

^bDepartment of Physics, SSDM College, Kovilpatti-628501, TamilNadu, India.

^cPG and Research Department of Physics, Sri Paramakalyani College,

Alwarkurichi, Tenkasi-627412, Tamil Nadu, India (Affiliated to Manonmanium

Sundaranar University, Tirunelveli - 627018)

Pure Lanthanum Ferrite (LaFeO3) nanoparticles and Lanthanum Magnesium Ferrite (LaMgxFe1-xO3) nanocomposites have been prepared by the sol-gel auto-combustion method. The structural and morphological properties were investigated by X-ray diffraction (XRD), Scanning electron microscopy (SEM) and energy dispersive X-ray (EDAX) spectroscopy. Powder XRD studies revealed that the samples are pure orthorhombic perovskite crystals with a size of around 20–50 nm. The FT-IR spectra of pure and composites was confirmed the formation perovskite structure. It has been discovered that composites material functions as an electrode in supercapacitors after its electrical characteristics have been examined by galvanostatic charging and discharging (GCD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) with a 2 M KOH electrolyte.