# Siam Physics Congress 2015

20-22 May 2015
Asia/Bangkok timezone
The Centennial Celebration of General Relativity Theory and 80 Years of Thai Physics Graduate

## Effect of Annealing on Magnetic Properties of SrTi${}_{1-x}$Co${}_x$O${}_3$ Nanoparticles Prepared by Hydrothermal Method

21 May 2015, 13:00
3h 30m
Board: MNA-09
Poster presentation Material Physics, Nanoscale Physics and Nanotechnology

### 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.

### Primary 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)

### Presentation Materials

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