doiSerbia

Synthesis and characterization of monophase CaO-TiO2-SiO2 (sphene) based glass-ceramics

Maletaškić Jelena (University of Belgrade, Belgrade, Serbia + Laboratory for Advanced Nuclear Energy, Institute of Inovative Research, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, Japan )
Todorović Bratislav (Faculty of Technology, University of Niš, Leskovac, Serbia)
Gilić Martina (Institute of Physics, University of Belgrade, Belgrade, Serbia)
Marinović-Cincović Milena (Institute of Nuclear Sciences Vinča, Laboratory for Radiation Chemistry and Physics, University of Belgrade, Belgrade, Serbia)
Yoshida Katsumi (Laboratory for Advanced Nuclear Energy, Institute of Inovative Research, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, Japan)
Gubarevich Anna (Laboratory for Advanced Nuclear Energy, Institute of Inovative Research, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, Japan)
Matović Branko (Institute of Nuclear Sciences Vinča, Department of Material Science, Center of Exselence, CEXTREME LAB University of Belgrade, Belgrade, Serbia)

Sphene based glass-ceramics (CaTiSiO5), an excellent candidate for a host lattice of ceramic materials and for nuclear waste immobilization, has been prepared from a powder mixture of CaCO3, TiO2 and SiO2 using vibro-milling for homogenization. Starting powders were melted at 1400°C for 2 h, cooled to room temperature, grounded again, then crystallized by thermal treatment yielding a sphene glass-ceramic. The evolution of the phase composition during thermal treatment was investigated by X-ray powder diffraction (XRPD), FT-IR, Raman and thermal analyses (TG-DTA). Pure synthetic single phase sphene was formed at 800°C for 4 h, even it is very hard to obtain monophase powder at such low temperature. Powder morphology was analyzed by scanning electron microscopy (SEM).

Keywords: sphene, glass-ceramics, mechanochemistry, XRPD, TG-DTA

Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. 45012