1. Department of Frontier Materials; Nagoya Institute of Technology; Gokiso-cho, Showa-ku Nagoya Aichi 466-8555 Japan
2. National Institute of Advanced Industrial Science and Technology (AIST); 2266-98 Shimo-Shidami Nagoya 463-8560 Japan
3. Japan Fine Ceramics Co., Ltd.; 3-10 Akedori Sendai 981-3203 Japan