1. Department of Materials Engineering Science; Osaka University; Toyonaka Osaka 560-8531 Japan
2. Department of Material Process for Circulatory Society; Tohoku University; Sendai Miyagi 980-8579 Japan
3. Department of Materials Science; Nagoya University; Chikusa-ku Nagoya 464-8603 Japan
4. Crystal Growth Laboratory; University of Victoria; Victoria BC V8W 3P6 Canada