1. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University; Chiang Mai 50200 Thailand
2. Department of Materials Science and Technology, Faculty of Science, Prince of Songkla University; Hat Yai Songkhla, 90112 Thailand
3. School of Ceramic Engineering, Suranaree University of Technology; Nakhon Ratchasima 30000 Thailand
4. Center of Excellence in Materials Science and Technology, Materials Science Research Center, Faculty of Science, Chiang Mai University; Chiang Mai 50200 Thailand