Comparative Study of Structural and Magnetic Properties of undoped and Sr-doped LaFeO3 Perovskites
Nursha Mutiara(1), Marzuki Naibaho (1), Januar Widakdo(1*) and Masno Ginting(2)

1. Department of Physics, Universitas Indonesia, Depok, South Tangerang, 16424, Indonesia

2. Research Center for Energy Materials (PRME) - National Research and Innovation Agency (BRIN), Complex Puspiptek Building 440-441, South Tangerang, 15314, Indonesia

Abstract

This study investigates the effect of Sr substitution x = 0.1 on the structural and magnetic properties of LaFeO3 synthesized via the solid state method X ray diffraction XRD analysis confirms that both undoped and Sr doped samples crystallize in an orthorhombic perovskite structure with a slight peak shift toward lower angles and peak broadening in the doped sample indicating lattice expansion and reduced crystallite size from 76.7 nm to 46.3 nm as calculated using the Debye Scherrer equation Scanning electron microscopy SEM reveals agglomerated particles with irregular morphology where the average particle size decreases from 76.81 nm to 67.48 nm upon Sr doping Fourier transform infrared FTIR spectra exhibit a characteristic Fe O vibrational band around 500-600 cm confirming the formation of FeO6 octahedra with slight shifts indicating structural distortion due to Sr incorporation Magnetic measurements using vibrating sample magnetometry VSM show a significant enhancement in magnetic properties where the saturation magnetization increases from 0.089 emu/g to 2.66 emu/g and coercivity from 0.056 T to 0.395 T This improvement is attributed to the formation of mixed valence states which promote double exchange interactions as well as lattice distortion and reduced crystallite size that enhance spin canting and magnetic anisotropy These results demonstrate that Sr doping effectively tailors the structural and magnetic behavior of LaFeO3 making it a promising material for advanced magnetic applications

Keywords: LaFeO3, Sr doping, perovskite oxide, magnetic properties, solid state reaction

Topic: Material Physics