1. Department of Chemistry & Chemical Engineering Faculty of Engineering, and Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-nocho, Niigata 950-2181, Japan, and Technical Department and Fine Ceramics Division, Krosakiharima Corporation, 1-1 Higashihamamachi, Yawatanishi-ku, Kitakyushu 806-8586, Japan