A spectroscopic study of the structure of glasses in the CaO-SiO2 system

Towards the synthesis of an Mg-containing silicate glass–ceramic to be used as a scaffold for cementum/alveolar bone regeneration

“…However, no Ca-Si phase is present in sample 50S20Mg, which can be clearly attributed to the decrease of SiO 2 content. Furthermore, as expected by the phase diagram of the ternary system CaO-MgO-SiO 2 , diopside crystallized in both materials, while akermanite was also formed in the high MgO content material (50S20Mg) [41,43,44].…”

“…2), the increase of the MgO content, at the expense of the CaO content in glasses of group A (70S-70S20Mg), promoted the crystallization of wollastonite instead of pseudowollastonite upon sintering at 1050 1C, which is supported by the fact that pseudowollastonite is usually formed in Ca-rich environments [45,46]. Furthermore, based on the phase diagram of the ternary system CaO-MgO-SiO 2 , wollastonite and diopside are the thermodynamically stable phases for the compositions 70S20Mg and 70S10Mg at temperatures below 1400 K [41,43,44].…”

“…As proven both theoretically and experimentally by several authors [41,42], wollastonite and pseudowollastonite are the thermodynamically stable phases crystallized in the case of the binary compositions with more than 50 mol% of SiO 2 . Furthermore, even though pseudowollastonite is considered as a high temperature polymorphism of wollastonite, it has been previously reported that it can form at lower temperatures in Ca-rich environments [41,43,44].…”

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“…This increase can be attributed to the respective formation of one or more Ca-based crystalline phases in the material, since it can be connected with the ordering of the Si-O-Ca bonds [182]. Furthermore, the formation of the strong peak at 714 cm -1 can be related to the formation of cyclic anions [155], which is an indication of the presence of pseudowollastonite (PsW, a-CaSiO3). Finally, the double peak at 564 and 604cm -1 indicate the crystallization of one or more crystalline phases containing .…”

“…~ 68 ~ crystallization of dicalcium silicate. Wollastonite is previously reported to be formed upon heating of glasses of the ternary [154] and binary [155,156] systems.…”