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Journal of Sol-Gel Science and Technology

, Volume 58, Issue 2, pp 507–517 | Cite as

Structural and thermal properties of monolithic silica–phosphate (SiO2–P2O5) gel glasses prepared by sol–gel technique

  • M. Kamal
  • I. K. BattishaEmail author
  • M. A. Salem
  • A. M. S. El Nahrawy
Original Paper

Abstract

A sol–gel process for producing monolithic silica–phosphate (SiO2–P2O5) system different concentrations of P2O5, starting with tetra-ethoxysilane TEOS, and triethyl-phosphate as sources of SiO2 and P2O5 was performed. The gels were heat-treated at temperatures ranging from 100 up to 900 °C. The structural and chemical analyses of the samples were determined by using X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). It was found from the XRD that the existence of phosphorus enhances the crystallization of silica gel, while the FTIR indicated the main functional groups of silica–phosphate. It is important to study the effect of hydroxyl in silica–phosphate glass. The results obtained are promising to use the prepared samples in a variety of applications, ranging from traditional application such as lighting products) to the modern application (such as optical fibers. Optical studies were measured by using the spectrophotometer in wavelength range 0.2–2.5 μm. The refractive index (n) was calculated for the prepared samples, it was found to be strongly affected by structural rearrangement resulting from the elimination of the solvent and the Si–OH, Si–O–Si and Si–O–OH bonding by phosphate and aluminum and it increases by increasing phosphate concentrations. The weight losses have investigated for prepared samples.

Keywords

Sol–gel Gelation Silica–phosphate glass FTIR 

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • M. Kamal
    • 1
  • I. K. Battisha
    • 2
    Email author
  • M. A. Salem
    • 2
  • A. M. S. El Nahrawy
    • 2
  1. 1.Physics DepartmentEl Mansoura UniversityMansouraEgypt
  2. 2.Department of Solid State PhysicsNational Research Center, NRCDoki, GizaEgypt

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