The Anorthite–Diopside System: Structural and Devitrification Study. Part II: Crystallinity Analysis by the Rietveld–RIR Method

Abstract

The crystallization behavior of 10 binary glasses belonging to the CaO–MgO–Al2O3–SiO2 quaternary system and two glasses corresponding to anorthite and diopside composition was investigated by X‐ray diffraction, thermal, and thermomechanical analyses, and scanning electron microscopy. Particular emphasis is laid on the quantitative X‐ray diffraction analysis by the Rietveld–reference intensity ratio combined procedure, which seems to be a useful tool to obtain time–temperature–transformation diagrams. Results showed that to obtain glass–ceramics with a significant crystalline phase presence, it is necessary to treat samples at 1000°C for 4 h or at 1100°C for 1 h.

Crystallization behaviour, structure and properties of sintered glasses in the diopside–Ca-Tschermak system

“…The two methods (Kissinger and Ozawa) yielded quite similar E a values for each composition, which usually happens in cases of weak dependence of T p on heating rate. 19 The values of Table 3 agree to E a values reported for glasses with composition of diopside (573 kJ/mol) 20 and diopside-anorthite (367-670 kJ/mol), 21 which are also prone to surface crystallization. Table 3 Activation energy for crystallization of the investigated glasses calculated by Eqs.…”

Preparation of ceramic wall tiling derived from blast furnace slag

“…The value of the TEC could be calculated by using a simple rule of mixtures, consistent with the relative proportions of the phases [18]. Anorthite-based ceramic has a low TEC value due to the formation of a single anorthite phase [19].…”

Sintering and crystallization behavior of CaMgSi2O6–NaFeSi2O6 based glass-ceramics

“…9, Table II͒ reveals that all the resultant glass-ceramics have a high degree of crystallization ͑glassy phase: 10%-40%͒. 13 Figure 9 shows the refinement of a glass-ceramic powder compact fired at 950°C in N 2 atmosphere. The crystallinity in the glass-ceramics decreases with an increase in temperature from 850 to 900°C, irrespective of the atmosphere, while it increases with further increase in temperature to 950°C.…”

“…The stoichiometric diopside glasses and resultant glass-ceramics have been investigated by many researchers for several properties and mechanisms due to their wide applicability in different practical applications. [12][13][14] In our previous studies, we have investigated the development of glasses and glass-ceramics along the diopside-Ca-Tschermak join. [15][16][17] It has been reported that all the compositions exhibit good glass forming ability and sinterability, and the solubility limit of Ca-Tschermak in diopside is about 30 mol %.…”