[1] Dept. of Inorg. Composite Materials, Kyushu Natl. Indust. Res. Institute, 807-1, Shuku-machi, Tosu-shi, Saga 841-0052, Japan
[2] Co-operation Program between KNIRI, Graduate School of Saga University, 807-1, Shuku-machi, Tosu-shi, Saga 841-0052, Japan
[3] Industrial Technology Center of Saga, 114, Yaemizo, Nabeshima-cho, Saga-shi 849-0932, Japan