Publikace detail

Thermal properties and crystallization of MgO-FeOx-P2O5 glassess

Autoři: Mošner Petr | Račický Antonín | Koudelka Ladislav

Rok: 2018

Druh publikace: článek v odborném periodiku

Název zdroje: Journal of Thermal Analysis and Calorimetry

Název nakladatele: Springer

Místo vydání: Dordrecht

Strana od-do: 843-850

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
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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