1. Ceramic Physics Laboratory, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, 606-8585 Kyoto, Japan
2. University of Chemistry and Technology Prague, Technická 5, Praha 6, 166 28 Prague, Czech Republic
3. Shenyang University of Chemical Technology, No. 11 Street, Shenyang Economic & Technological Development Zone, 110142 Shenyang, Liaoning, China