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, Volume 12, Issue 1, pp 117–124 | Cite as

Structural Characterizations and Mechanical Behavior of Activated Clay-Based Si5(PO4)6O and SiP2O7 Compounds

  • Mohamed KhabbouchiEmail author
  • Khaled Hosni
  • Mohamed Mezni
  • Ezzeddine Srasra
Original Paper
  • 35 Downloads

Abstract

Well-crystalline and low-cost silico-phosphate materials were prepared by a simple procedure, different from that previously reported by sol-gel method. In this case, the Si5(PO4)6O and SiP2O7 compound have been synthesized from the mixtures of activated clay –H3PO4 (70 wt% H3PO4 and 80 wt% H3PO4). The structural changes induced by thermal treatment, have been studied by X-ray diffraction (XRD), Fourier transformed infrared (FTIR) spectroscopy, 31P, 29Si MAS-NMR techniques and by the mechanical Brazilian test. The XRD results showed that the well-crystalline Si5(PO4)6O material has been synthesized from a heat treatment at 800 °C. Meanwhile, the well- crystalline SiP2O7 material has been obtained after a heat treatment at 500 °C. These results were confirmed by 31P and 29Si MAS-NMR. the mechanical Brazilian test results showed that the silicophosphates SiP2O7 has high mechanical properties compared to Si5(PO4)6O. At 900 °C, the mechanical strength has increased from 6.58 for Si5O(PO4)6 to 21.02 MPa for SiP2O7.

Keywords

Activated kaolin Amorphous silica Phosphoric acid Silicophosphate, mechanical properties 

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Notes

Acknowledgments

The authors would like to thank the Faculty of Sciences of Tunis for its collaboration.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Mohamed Khabbouchi
    • 1
    Email author
  • Khaled Hosni
    • 1
  • Mohamed Mezni
    • 1
  • Ezzeddine Srasra
    • 1
  1. 1.CNRSM, National Center of Materials Science ResearchSolimanTunisia

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