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Journal of Thermal Analysis and Calorimetry

, Volume 137, Issue 6, pp 1911–1918 | Cite as

Thermoanalytical study and crystallization of Ba(PO3)2–WO3 glasses

  • Petr KalendaEmail author
  • Ladislav Koudelka
  • Petr Mošner
  • Ludvík Beneš
  • Helena Drobná
Article
  • 45 Downloads

Abstract

Barium phosphate glasses of the composition (100 − x)Ba(PO3)2xWO3 with 0–60 mol% WO3 were prepared and studied. Thermal studies of the glasses were carried out with DTA, dilatometry and hot-stage microscopy. Glass transition temperature in this glass series increases with increasing WO3 content from 461 °C (x = 0) to 623 °C (x = 60). Most glasses containing WO3 crystallize on heating within the range of 650–750 °C with the exception of glasses with 20–30 mol% WO3, which are thermally stable. Very high chemical durability of these glasses with dissolution rate of 1.4 × 10−8–6.2 × 10−9 g cm−2 min−1 was also revealed. Crystallization of glasses revealed the existence of a new compound Ba(WO2)2(PO4)2 in the studied compositional series. The compound Ba(WO2)2(PO4)2 possess hexagonal unit cell of dimensions a = 11.5191(1) Å and c = 6.3437(1) Å, and its melting point is 936 °C. Raman spectra of crystallized glasses confirmed the formation of crystalline compound in this glass series and revealed the presence of glass phase in some thermal-treated samples. 31P MAS NMR showed on only one coordination of phosphorus atoms in the Ba(WO2)2(PO4)2 compound.

Keywords

Phosphate glasses Thermal properties Physical properties Crystallization 

Notes

Acknowledgements

The Czech authors are grateful for the financial support from the Project No. 18-01976S of the Grant Agency of the Czech Republic. EDS measurements were taken with the support of the Grants LM2015082 and ED4.100/11.0251 provided by the MSMT Czech Republic. The authors thank L. Montagne and B. Revel for the 31P MAS NMR spectra of the polycrystalline Ba(WO2)2(PO4)2 compound and the corresponding glass of the same composition.

Supplementary material

10973_2019_8115_MOESM1_ESM.docx (16 kb)
Supplementary material 1 (DOCX 16 kb)

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • Petr Kalenda
    • 1
    Email author
  • Ladislav Koudelka
    • 1
  • Petr Mošner
    • 1
  • Ludvík Beneš
    • 2
  • Helena Drobná
    • 3
  1. 1.Department of General and Inorganic Chemistry, Faculty of Chemical TechnologyUniversity of PardubicePardubiceCzech Republic
  2. 2.Joint Laboratory of Solid State ChemistryUniversity of PardubicePardubiceCzech Republic
  3. 3.Department of Physical Chemistry, Faculty of Chemical TechnologyUniversity of PardubicePardubiceCzech Republic

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