Affiliation: | 1. Department of Applied Chemistry, Kumoh National Institute of Technology, Gumi 730‐701, Korea;2. On leave from the Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA;3. Division of Materials Science and Engineering, Hanyang University, Seoul, Korea;4. Beamline Research Division, Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790‐784, Korea |