1. Korea Institute of Industrial Technology; Korea Institute for Rare Metals; Incheon 406-840 Korea
2. Department of Materials Science and Engineering; Korea University; Seoul 136-713 Korea
3. Advanced Materials & Processing Center; Institute for Advanced Engineering (IAE); Yongin-Si 449-863 Korea
4. Department of Rare Metals Engineering; UST; Daejeon 305-350 Korea