1. Department of Chemical Engineering and Applied Chemistry; Chungnam National University; 220 Gung-Dong, Yuseong-Gu Daejeon 305-764 Korea
2. Theoretical Physics Research Group; Ton Duc Thang University; Ho Chi Minh City Vietnam
3. Faculty of Applied Sciences; Ton Duc Thang University; Ho Chi Minh City Vietnam
4. Department of Materials Science and Engineering; Chungnam National University; Daejeon 305-764 Korea
5. Department of Chemical Engineering, Division of Advanced Nuclear Engineering; Pohang University of Science and Technology; Pohang 790-784 Korea
6. Department of Physics and Oxide Research Center; Hankuk University of Foreign Studies; Yongin 449-791 South Korea