Affiliation: | a Physics Department, National Taras Shevchenko Kyiv University, 2/1 Akademik Glushkov prosp., 03127 Kyiv, Ukraine b Laboratory of Technical Ceramics and Silicates, Gomel State Technical University, 48 October prosp., 246746 Gomel, Belarus c Center for Interdisciplinary Research, Tohoku University, Aoba-ku, Aramaki Aza Aoba, 980-8578 Sendai, Japan |