Speaker
Mr
Likkhasit Wannasen
(Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand)
Description
SrTi${}_{0.90}$Fe${}_{0.10}$O${}_3$ nanoparticles were synthesized by hydrothermal method. SrTi${}_{0.90}$Fe${}_{0.10}$O${}_3$ samples were annealed at 500, 600 and 700${}^{\circ}$C in Ar. X-ray diffraction (XRD) results indicate a perovskite structure of all samples. TEM image shows SrTi${}_{0.95}$Fe${}_{0.05}$O${}_3$ nanoparticles of a cubic shape with an average size of 64.7 nm. X-ray absorption spectroscopy (XAS) was used to study the absorption of SrTi${}_{0.90}$Fe${}_{0.10}$O${}_3$ with various formal valences. The results show that Fe with oxidation states of Fe${}^{2+}$ and Fe${}^{3+}$ are presented in sample. Magnetic properties were measured using vibrating sample magnetometer (VSM). SrTi${}_{0.90}$Fe${}_{0.10}$O${}_3$ exhibits paramagnetic behavior. However, It is found that annealed SrTi${}_{0.95}$Fe${}_{0.05}$O${}_3$ in Ar can increase more oxygen vacancies in the structure causing the F-centre exchange (FCE) coupling interaction of metallic ions resulting in ferromagnetic with the maximum magnetization value of 2.24 emu/g for sample annealed at 700 ${}^{\circ}$C.
Author
Mr
Likkhasit Wannasen
(Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand)
