1. College of Physics and Lab of New Fiber Materials and Modern Textile; Growing Base for State Key Laboratory; Qingdao University; Qingdao 266071 P.R. China
2. Electronic Ceramics Center; Dong-Eui University; Busan 614-714 Korea
3. Department of Materials Science/CENIMAT-I3N, Faculty of Sciences and Technology; New University of Lisbon and CEMOP-UNINOVA; Campus de Caparica; 2829-516 Caparica Portugal