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Title of Journal: J SolGel Sci Technol

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Abbravation: Journal of Sol-Gel Science and Technology

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Springer US

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DOI

10.1002/ppap.201600175

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1573-4846

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The effect of POSubscript25/Subscript and AlO

Authors: H C Vasconcelos
Publish Date: 2010/04/26
Volume: 55, Issue: 1, Pages: 126-133
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Abstract

SiO2TiO2PO25 STP and SiO2TiO2AlO15 STA glasses were prepared by solgel processing Their infrared absorption spectra IR differential thermal analysis curves DTA and Xray diffraction patterns XRD have been recorded In the SiO2TiO2 system the chemical homogeneity of the solgel glass could be evaluated by the relative concentration of SiOTi heterocondensation comparing to SiOSi homocondensation For the STA system a gradual decrease of the SiOTi/SiOSi band ratio based on IR spectra with the addition of Al2O3 is observed with the simultaneous formation of SiOAl and TiOAl bounds ie Al3 + ions are dissolved in the SiO2TiO2 glass matrix and do not promote glassinglass phaseseparation in the composition range of 0–15 mol AlO15 In the STP system on the other hand P=O bond IR stretch in the ternary glasses indicates that P=O free PO2O2/2 − tetrahedra are formed rather than the double bonded POO3/2 tetrahedra that usually occur in binary SiO2P2O5 glasses It can be concluded that SiO2TiO2P2O5 glass separates into a SiO2rich phase and a TiO2P2O5rich phase During heattreatment in STA system only anatase precipitates even at T ~ 1000 °C while in for STP anatase TiO2 or TiO2P2O7 TOP crystals precipitate at ~600 °C depending on the P2O5 concentration The major crystal phase cristobalite precipitated at ~1000 °C and at ~1200 °C the Pcontaining phase melts

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  4. Biosynthesis of silver nanoparticles using Lantana camara flower extract and its application
  5. Structure, photoluminescence and electrical properties of Eu–Nd codoped CaBi 4 Ti 4 O 15 synthesized by sol–gel method
  6. Influences of preferred orientation growth on electrical properties of ZnO:Al films by sol–gel method
  7. Synthesis of nanosized carbonated apatite by a modified Pechini method: hydroxyapatite nucleation from a polymeric matrix
  8. Effect of excess methanol addition on the morphology of sonogel-derived silica
  9. Removal of Pb(II) ions from aqueous systems using thiol-functionalized cobalt-ferrite magnetic nanoparticles
  10. Simple synthesis of Co 3 O 4 nanoflakes using a low temperature sol–gel method suitable for photodegradation of dyes
  11. Antiwetting silica–gelatin nanohybrid and transparent nano coatings synthesised through an aqueous sol–gel process
  12. Comparison of structure and phase change characteristic of microencapsulated core/shell Al–Si alloy microparticles synthesized by two methods
  13. Bioencapsulation of living yeast ( Pichia pastoris ) with silica after transformation with lysozyme gene
  14. Optical properties of yellow-light-emitting LiZnVO 4 :Eu 3+ phosphor prepared by sol–gel method
  15. CuAl 2 O 4 powder synthesis by sol-gel method and its photodegradation property under visible light irradiation
  16. GPS patch antenna performance by modification of Zn (1−x) Ca x Al 2 O 4 -based microwave dielectric ceramics
  17. Effect of thermal annealing on Nd 2 O 3 -doped silica powder prepared by the solgel process
  18. Effect of sulphate groups on catalytic properties of chromium supported by zirconia in the n -hexane aromatization
  19. Synthesis of LiCoO 2 by l -apple acid assisted sol–gel method and its electrochemical behavior in aqueous lithium-ion battery
  20. Investigation of Br–N Co-doped TiO 2 photocatalysts: preparation and photocatalytic activities under visible light
  21. Optimization of process variables and corrosion properties of a multi layer silica sol gel coating on AZ91D using the Box–Behnken design
  22. Al 2 O 3 /TiO 2 core/shell powder derived by novel sol–gel routes
  23. A new surface modification method to improve the dispersity of nano-silica in organic solvents
  24. Synthesis of BiFeO 3 nanoparticles with small size
  25. Sustained release drug delivery using supramolecular hydrogels of the triblock copolymer PCL–PEG–PCL and α-cyclodextrin
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