Raman and infrared spectroscopy study on structure and microstructure of glass–ceramic materials from SiO2–Al2O3–Na2O–K2O–CaO system modified by variable molar ratio of SiO2/Al2O3

• Article is focused on effect of SiO2/Al2O3 ratio on microstructure of glass–ceramic.
• Glass–ceramic materials from oxide system of SiO2–Al2O3–CaO–MgO–Na2O–K2O.
• Glass–ceramic within SiO2/Al2O3 molar ratio in range from 3.23 to 11.7.
• SiO2/Al2O3 ratio has a decisive influence on formation of NBO and BO bonds.
• SiO2/Al2O3 ratio has an influence on formation of crystalline phase.

This paper is focused on the effect of the molar ratio of SiO2/Al2O3 on the microstructure and structure of the internal aluminium–silicon-oxide lattice of the glass–ceramic materials from the SiO2–Al2O3–Na2O–K2O–CaO system. In order to examine the real composition of the obtained samples, a chemical analysis was performed. Following the heat-treatment procedure, pseudowollastonite, anorthite and the vitreous phase were identified. In order to determine the microstructure, research using the scanning electron microscope (SEM) with EDS was done. For the inner structural study, X-ray diffraction (XRD), Raman spectroscopy as well as MIR and FIR spectroscopy were performed.

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