1. Department of Materials Science and Engineering, Kyushu Institute of Technology 1 , 1-1 Sensui-cho, Tobata-ku, Kitakyushu 804-8550, Japan
2. Grid Innovation Research Laboratory, Central Research Institute of Electric Power Industry 2 , Yokosuka, Kanagawa 240-0196, Japan
3. Department of Basic Sciences, Kyushu Institute of Technology 3 , 1-1 Sensui-cho, Tobata-ku, Kitakyushu 804-8550, Japan