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Thermal study of Mn-containing silicate–phosphate glasses

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Abstract

Silicate-phosphate glasses of SiO2–P2O5–K2O–MgO–CaO system containing manganese cations were investigated to obtain information about the influence of manganese ions on the thermal behavior of such glasses. Amorphous state of glasses and the course of phase transformation and crystallization taking place during their heating were investigated by DSC, XRD, and FTIR methods. It was shown that an increasing content of manganese replacing calcium and magnesium in the structure of analyzed glasses causes decrease of glass transition temperature (T g) and heat capacity change (Δc p) accompanying the glass transformation. Simultaneously, thermal stability of the glasses increased. Products of multistage crystallization of glasses containing up to 8 mol% of MnO2 were: marokite (CaMn2O4), phosphate of Ca9MgK(PO4)7 type, and diopside (CaMgSi2O6). Product of crystallization of glasses containing higher amount of manganese was braunite (Mn7O8SiO4). This was accompanied by change of structure of magnesium calcium silicates from diopside-type structure to akermanite-type silicates (Ca2MgSi2O7). The data interpretation was based on bonds and chemical interactions of the individual components forming the glass structure.

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Acknowledgements

The study was supported by the Grant No. N R08 0010 06 of the Polish Ministry of Science Higher Education and by Faculty of Materials Science and Ceramics AGH – University of Science and Technology (2011) No. 11.11.160.364.

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Authors and Affiliations

  1. Department of Advanced Ceramics, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Aleja Adama Mickiewicza 30, 30-059, Kraków, Polska

    Magdalena Szumera & Irena Wacławska

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  1. Magdalena Szumera
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  2. Irena Wacławska
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Correspondence to Magdalena Szumera.

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Szumera, M., Wacławska, I. Thermal study of Mn-containing silicate–phosphate glasses. J Therm Anal Calorim 108, 583–588 (2012). https://doi.org/10.1007/s10973-011-1941-7

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