1. Department of Physics, Naresuan University, Muang, Pitsanulok, Thailand;
2. School of Metallurgical Engineering, Institute of Engineering, Suranaree University of Technology, Nakhon Ratchasima, Nakhon Ratchasima, Thailand;
3. Powder Metallurgy Research and Development Unit (PM_RDU), Thailand National Metal and Materials Technology Center, Khlong Neung, Pathum Thani, Thailand