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

Mohammadi, M. R ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1016/j.partic.2010.08.012
  3. Publisher: 2011
  4. Abstract:
  5. 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
  6. Keywords:
  7. Nanostructure ; Annealing temperatures ; Average grain size ; Barium strontium titanate thin films ; BET surface area ; Brunauer emmett tellers ; BST thin films ; Field emission scanning electron microscopes ; Mesoporous ; Mesoporous structures ; Nano-crystalline structures ; Nanocrystallines ; Orientation growth ; Plate shape ; Room temperature ; Sol-gel chemistry ; Sol-gel routes ; Atomic force microscopy ; Barium ; Barium titanate ; Crystallite size ; Electron microscopes ; Film preparation ; Gels ; Mesoporous materials ; Nanocrystalline powders ; Particle size analysis ; Perovskite ; Powders ; Scanning electron microscopy ; Sol-gel process ; Sol-gels ; Sols ; Strontium ; Strontium titanates ; Thin films ; Transmission electron microscopy ; X ray diffraction ; Barium strontium titanate
  8. Source: Particuology ; Volume 9, Issue 3 , June , 2011 , Pages 235-242 ; 16742001 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S1674200111000319