Sol-gel derived nanocrystalline and mesoporous barium strontium titanate prepared at room temperature

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    Abstract

    Perovskite-type barium strontium titanate (BST) thin films and powders with nanocrystalline and mesoporous structure were prepared by a straightforward particulate sol-gel route at room temperature. The prepared sol had a narrow particle size distribution of about 20 nm. X-ray diffraction (XRD) revealed that phase composition and preferable orientation growth of BST depended upon the annealing temperature. Transmission electron microscope (TEM) images showed that the crystallite size of the powders decreased with increasing annealing temperature from 8 nm at 25 °C down to 5 nm at 800 °C. Field emission scanning electron microscope (FE-SEM) analysis and atomic force microscope (AFM) images revealed that BST thin films had mesoporous and nanocrystalline structure with average grain size of 30 nm at 600 °C. Based on Brunauer-Emmett-Teller (BET) analysis, the synthesized BST showed mesoporous structure containing pores with needle and plate shapes and BET surface area in the range of 49-32 m2/g at 500-800 °C.

    Original languageEnglish
    Pages (from-to)235-242
    Number of pages8
    JournalParticuology
    Volume9
    Issue number3
    DOIs
    Publication statusPublished - Jun 2011

    Keywords

    • Barium strontium titanate
    • Nanostructure
    • Room temperature
    • Sol-gel chemistry

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