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Effect of Er2O3 on thermal stability of oxyfluoride glass

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Abstract

Glasses have been synthesized in the system SiO2–Al2O3–Na2O–AlF3–LaF3–Er2O3. A base glass (in mol% 67SiO2–9Al2O3–20Na2O–Al2F6–3La2F6) was modified by 0.5, 0.75, 1, 1.25, 1.5, 2 and 5 mol% Er2O3, respectively. Glasses were prepared by conventional fusion method from 20 g batches. The glass transition temperature (T g), the jump-like changes of the specific heat (ΔC p) accompanying the glass transition and the enthalpy of crystallization (ΔH) were calculated. DTA measurements clearly reveal that the increase of the Er2O3 content in the glass changes the effects of crystallization and diminishes the thermal stability of the glassy network. In the same time the changes in the transition temperature are observed. The formation of NaLaF4 and Na1.45La9.31(SiO4)6(F0.9O1.1) as a main phase was confirmed. The diminishing of the thermal stability was connected with erbium which incorporated into Na1.45La9.31(SiO4)6(F0.9O1.1) structure.

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Acknowledgements

The work was supported by the Polish Ministry of Education and Science, grant No. 3T08D04829.

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  1. Faculty of Material Science and Ceramics, AGH-University of Science and Technology, al. Mickiewicza 30, 30-059, Kraków, Poland

    Marcin Środa

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  1. Marcin Środa
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Correspondence to Marcin Środa.

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Środa, M. Effect of Er2O3 on thermal stability of oxyfluoride glass. J Therm Anal Calorim 97, 239–243 (2009). https://doi.org/10.1007/s10973-009-0257-3

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