The effect of initial oxidation state on crystallization of basaltic glass

Crystallisation behaviour and high-temperature stability of stone wool fibres

“…Recently, some studies have been conducted regarding the influence of oxygen partial pressure, 3,13 redox state and amount of iron, [14][15][16][17][18] heat-treatment schedule, 19,20 and chemical aging 21 on the crystallisation behaviour of iron-bearing silicate glasses. However, to our knowledge, the effects of both chemical composition and heat-treatment atmosphere have not yet been investigated in the same study.…”

Sinter-crystallization of a glass obtained from basaltic tuffs

“…For this reason, the sinter-crystallization technique was preferred. In previous works, it was demonstrated that the phase formation rate in iron-rich compositions depends on the Fe 2+ /Fe 3+ ratio: the closer is this ratio to magnetite (FeO AE Fe 2 O 3 ) value of 0.5 the higher is the crystallization trend [3,6,9,10,24,28]. The Fe 2+ /Fe 3+ ratio also influences the sinter-crystallization of the glass powders [8,16,17,20].…”

“…Until now, the petrurgy has mostly used tholeiite basalts or diabasic rocks [24][25][26][27][28], which, due to their higher viscosity, are characterized by a reduced tendency to spontaneous crystallization. On the other hand, the low viscosity alkaline basalts appear more appropriated for the production of sintered ceramic and glass-ceramic materials.…”

Crystallization Properties of the Glass Ceramics Prepared from Iron-Rich Nickel Slag

“…2. 6 ], with CaO and MgO forming a net structure and thereby increasing the viscosity [11][12][13][14][15]. Based on this theory, K sample is expected to enhance the control of glass crystallization because the iron exists as Fe 3+ which tends to increase the viscosity.…”