Tạp chí Khoa học và Giáo dục, S. 01(45) (2018)

Cỡ chữ:  Nhỏ  Vừa  Lớn

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

Nguyễn Thị Thủy, Trần Duy Thanh, Cao Thị Thùy Linh, Hoàng Hương Quỳnh

Tóm tắt

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(Fe0.4Cu0.1Ti0.5)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

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