Extraordinary magnetic properties of LaFeO3 system doped Ti, Co, Cu

Abstract

Abstract: LaFeO₃ system with doped Ti, Co, Cu was manufactured by solid state reaction method, it was sintered at 1250⁰C and 1290⁰C in 10 hours with a heating rate of 3⁰C/min. Using X-ray diffraction and Scanning Electron Microscope (SEM) to examine the structure, it reveals that samples are single-phase and orthogonal-perovskite structure describing by the Pnma space group, the unit cell volume of the samples increases when Ti, Co, Cu are doped to replace ion Fe⁺³. The size of particle increase while raising the temperature of sintering. Doping Ti, Co, Cu ions has strongly changed the magnetic properties of the sample system. Magnetic hysteresis loops M(H) and magnetocaloric M(T) of the samples are measured in different magnetic fields and show interesting results. All the samples shown strong ferromagnetism, among which La(Fe_0.4Cu_0.1Ti_0.5)O₃ shown the strongest and its Curie temperature is about 450⁰C.

Keywords: LaFeO₃ doped Ti, Co, Cu; magnetic hysteresis loop M(H); magnetocaloric loop M(T); strong ferromagnetism