Yoshiya Harada1, Shigeru Masuda, Hiroyuki Ozaki. 1. Department of Materials Science, Faculty of Engineering, Chiba University, Inage, Chiba 263, Japan, Department of Chemistry, Graduate School of Arts and Sciences, University of Tokyo, Komaba, Meguro, Tokyo 153, Japan, and Department of Material Systems Engineering, Faculty of Technology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184, Japan.