Abstract
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).
Highlights
Glass-ceramics can be used for various applications, such as thermal, chemical, biological and dielectric ones
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
The synthesis of the parent glass is an important step in preparing the final glass-ceramic material because the precursors and their percentage in the glass composition manage the precipitation of the crystalline phases
Summary
Glass-ceramics can be used for various applications, such as thermal, chemical, biological and dielectric ones. The Canadian Nuclear Fuel Waste Management program has considered the possibility of waste storage with glass-ceramics containing crystalline titanite embedded in an aluminosilicate glass [7, 8] It can be used for the stabilization of waste sludge [9, 10] and other waste material [11, 12]. Sphene is a phase well known for its excellent containment capacity and long-term behavior (high chemical durability and self-radiation resistance) It has good thermal stability and it is an excellent candidate as a host material [14], as well as biomedical engineering (coatings on Ti-6Al-4V) [15]. Calcination of powders was carried out at different temperatures from 600 to 1250 °C in at a heating rate of 10 °C/min and a soaking period of 4 h in alumina crucibles
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