1. Department of Material Science, Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka 558
2. Institute for Materials Research, Tohoku University, Aoba-ku, Sendai 980-77
3. Microcalorimetry Research Center, Faculty of Science, Osaka University, Toyonaka 560
4. Department of Chemistry, Faculty of Science, Tokyo Metropolitan University, Hachioji 192-03
5. Department of Pure and Applied Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Meguro-ku, Tokyo 153