CaZrTi₂O₇ zirconolite synthesis: From ceramic to glass‐ceramic

Abstract

The formation of CaZrTi 2 O 7 zirconolite and its crystallization in sodium aluminoborosilicate glass has been investigated via sintering in air. The ceramic precursor is prepared using a soft chemistry route to ensure ultimate mixing of the reactants at the molecular level. A nearly phase pure CaZrTi 2 O 7 zirconolite is formed after sintering the ceramic precursor at 1400°C for 12 hours. In order to form zirconolite glass-ceramics, various processing conditions are investigated including sintering temperatures, different glass composition precursors, and ceramic to glass weight ratios.Zirconolite crystallization on the surface and inside of glass-ceramic-pelletized samples is investigated. Higher ceramic to glass weight ratio leads to the formation of zirconolite as crystalline phase, which is quite dominant in glass.

Vitrification of wastes: from unwanted to controlled crystallization, a review

“…Many other recent studies have been made on zirconolite GC systems [Li et al, 2015, Wu et al, 2016b, including those focusing on phase evolution over time [Maddrell et al, 2017], effect of glass composition [Maddrell et al, 2015], and effect of redox conditions [Zhang et al, 2017a]. In some studies, a precursor ceramic zirconolite phase is used, then reacted with glass powder precursors, which is hence not a true GC by the definition espoused here [Kong et al, 2019].…”