Atomic scale structural analysis of liquid immiscibility in binary silicate melt: A case of SiO2‒TiO2 system

Phase equilibria and materials in the TiO2-SiO2-ZrO2 system: a review

“…The concepts of the nature of immiscibility in the TiO 2 -SiO 2 system, opposite to those of [63], are given in [66]. Thermodynamic/dynamic modeling of liquid immiscibility in silicate systems is seriously hampered by the lack of in situ studies of the structural evolution of the melt.…”

“…The structural features of the nodules were also investigated and found to be very similar to those of the TiO 2 melt, suggesting parallel crystallization behavior in the two cases. The authors [66] hope that their results will allow one to see the structural evolution of immiscible liquid phases on an atomic scale, which will contribute to the construction of a complete thermodynamic/dynamic structure describing systems of silicate immiscibility in the liquid phase outside of existing models. Thus, despite a large number of studies on phase equilibria in the TiO 2 -SiO 2 system, there are a number of conflicting information on the position of the phase equilibrium lines that require additional analysis, experimental and calculated refinements.…”

Glass-forming ability and structural features of melt-quenched and gel-derived SiO2-TiO2 glasses

“…Studies based on conventional melting focused mostly on the determination of a phase diagram for the system (Fig. Sup1), involving a eutectic point at ~8 mol% TiO2 and ~1550 °C [21] and a hightemperature liquid immiscibility field between ~20 mol% and ~90 mol% [23][24][25]. Despite the high melting temperatures and the strong devitrification tendency, some authors succeeded in characterizing SiO2-TiO2 glasses synthesized by electromelting, setting the limit of glass-forming ability at 10-12 mol% TiO2 [26,27] and invariably assuming a tetrahedral or mixed tetrahedral-octahedral oxygen coordination for Ti 4+ [26][27][28][29].…”