Speaker
Mr
Attaphol Karaphun
(Department of Material Science and Nanotechnology, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)
Description
Co-doped SrTiO${}_3$ (SrTi${}_{1-x}$Co${}_x$O${}_3$) ($x$=0, 0.05, 0.1 and 0.15) nanopowders were synthesized by hydrothermal method. Their morphology and structure were studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Magnetic properties were measured at room temperature using vibrating sample magnetometer (VSM). All samples show the major phase of a perovskite structure and the nanopowders consist of cubic-like particles with particle sizes in the range of 60- 120 nm. As-synthesized samples exhibit paramagnetic behavior and display the completed saturation ferromagnetic for samples annealed in Argon atmosphere at 800 ${}^{\circ}$C for 3 h. The ferromagnetic behavior in the annealed sample with $x$ = 0.15 is due to the impurity phase of CoO. However, for annealed samples with $x$ = 0.05 and 0.1, the observed ferromagnetic behavior is originated from the F-center mechanism. The saturation magnetization of annealed samples with $x$ = 0.05 and 0.1 are 0.048 and 1.080 emu/g, respectively.
Author
Mr
Attaphol Karaphun
(Department of Material Science and Nanotechnology, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)
Co-author
Dr
Ekaphan Swatsitang
(Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)
