1. Department of Physics and Materials Science; Faculty of Science; Chiang Mai University; Chiang Mai 50200 Thailand
2. Science and Technology Research Institute; Chiang Mai University; Chiang Mai 50200 Thailand
3. Materials Science Research Center; Faculty of Science; Chiang Mai University; Chiang Mai 50200 Thailand
4. Materials Science; School of Mechanical, Industrial and Manufacturing Engineering; Oregon State University; Corvallis Oregon 97331
5. School of Ceramic Engineering; Suranaree University of Technology; Nakhon Ratchasima 30000 Thailand