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Structure, thermal stability, and optical properties of boron modified nanocrystalline anatase prepared by chemical vapor synthesis
Imteyaz Ahmad Md, , Horst Hahn
Published in
2009
Volume: 105
   
Issue: 11
Abstract
Boron modified nanocrystalline anatase titania powders with boron contents varying from 0.5 to 6.2 wt % were synthesized by a chemical vapor synthesis process. High temperature x-ray diffraction studies revealed that the anatase powders containing more boron were more stable at higher temperatures. When present in small quantities (about 0.5 wt % or less), boron went into the structure of titania and lowered the direct band gap to 3.41 eV. On the other hand, higher boron contents resulted in smaller anatase crystallite sizes and partially offset the redshift. However, the excess boron formed boron oxide which probably coated the surface of the nanoparticles/crystallites resulting in improved high temperature stability of the anatase phase. © 2009 American Institute of Physics.
About the journal
JournalJournal of Applied Physics
ISSN00218979
Open AccessNo
Concepts (26)
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    ANATASE CRYSTALLITES
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    ANATASE PHASE
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    ANATASE POWDERS
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    BORON CONTENT
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    BORON OXIDES
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    CHEMICAL VAPOR SYNTHESIS
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    DIRECT BAND GAP
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    HIGH TEMPERATURE STABILITY
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    High temperature x-ray diffraction
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    Higher temperatures
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    NANOCRYSTALLINE ANATASE
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    Red shift
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    Thermal stability
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    Titania
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    Boron compounds
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    Chemical stability
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    Nanocrystalline alloys
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    Nanocrystalline powders
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    Optical properties
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    Powders
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    Synthesis (chemical)
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    Titanium dioxide
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    Titanium oxides
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    Vapors
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    X ray powder diffraction
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    Boron