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Publication detail

Thermal properties and crystallization of MgO-FeOx-P2O5 glassess
Authors: Mošner Petr | Račický Antonín | Koudelka Ladislav
Year: 2018
Type of publication: článek v odborném periodiku
Name of source: Journal of Thermal Analysis and Calorimetry
Publisher name: Springer
Place: Dordrecht
Page from-to: 843-850
Titles:
Language Name Abstract Keywords
cze Termické vlastnosti a krystalizace skel systému MgO-FeOx-P2O5 Pomocí DSC, TD a XRD bylo o studováno termické chování a stabilita skel kompoziční řady (40-x)MgO-xFe2O3-60P2O5 (x=0-40 mol% Fe2O3) připravených v platinovém a korundovém kelímku. fosforečnanová skla; Fe2O3; MgO; termická stabilita; krystalizace; vlastnosti
eng Thermal properties and crystallization of MgO-FeOx-P2O5 glassess Differential scanning calorimetry (DSC), dilatometry (TD) and X-ray diffraction have been used to study thermal behaviour and stability of glasses prepared simultaneously in Al2O3 or Pt crucibles in compositional series (40-x)MgO-xFe2O3-60P2O5 within the concentration range of x=0-40 mol% Fe2O3. Mössbauer spectra showed that all glasses with Fe2O3 contained both Fe(II) and Fe(III) ions. The contamination glasses from alumina crucibles ranged from 0.3 to 0.9 mol% Al2O3. The replacement of MgO by Fe2O3 resulted in a gradual decrease of glass transition temperature and dilatometric softening temperature, whereas thermal expansion coefficient did not changes significantly. The DSC curves showed that all glasses crystallize on heating in the broad temperature range 560-900oC. Crystallization temperature decreases with increasing Fe2O3 content. The highest tendency towards crystallization was found for the glass containing 40 mol% Fe2O3. X-ray diffraction measurements showed that the major compounds formed by glass crystallization were Mg(PO3)2, Fe(PO3)3, Fe3(P2O7)2 and FePO4. All thermoanalytical studies showed differences in thermal behaviour of glasses prepared in Al2O3 or Pt crucibles. Iron phosphate glasses; Magnesium oxide; Thermal stability; Crystallization; Properties

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