Effect of Er2O3 on thermal stability of oxyfluoride glass
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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.
KeywordsAluminosilicate glass DTA/DSC Erbium oxide LaF3 Oxyfluoride glass Thermal stability
The work was supported by the Polish Ministry of Education and Science, grant No. 3T08D04829.
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