Ceramic Research Institute     Dr.Manickam Sivakumar JSPS Research Fellow AIST JSPS Research Fellow 2266-98 Anagahora, Shimoshidami, Moriyama-Ku, Nagoya 463-8560, Ja phone 81-52-7367216 fax +492119847919 e-mail: manickam-sivakumar@aist.go.jp