1. National Institute of Advanced Industrial Science and Technology, 2217-14 Hayashi, Takamatsu 761-0395, Japan, Research Institute for Solvothermal Technology, 2217-43 Hayashi, Takamatsu 761-0301, Japan, and Department of Advanced Materials Science, Faculty of Engineering, Kagawa University, 2217-20 Hayashi, Takamatsu 761-0396, Japan