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Structure Evolution and Dielectric Behavior of Polystyrene-Capped Barium Titanate Nanoparticles
Journal of Materials Chemistry
  • H.Z. Guo, Iowa State University
  • Yaroslav Mudryk, Iowa State University
  • M.I. Ahmad, Iowa State University
  • X.C. Pang, Iowa State University
  • L. Zhao, Iowa State University
  • M. Akinc, Iowa State University
  • Vitalij K. Pecharsky, Iowa State University
  • Nicola Bowler, Iowa State University
  • Z.Q. Lin, Iowa State University
  • Xiaoli Tan, Iowa State University
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Polystyrene-capped barium titanate (BaTiO3) nanoparticles with sizes of 11 nm and 27 nm were prepared using amphiphilic star-like diblock copolymer templates. The crystal structure evolution of these nanoparticles over a wide temperature range (10-428 K) was investigated by powder X-ray diffraction. The Rietveld refinement indicates that the abrupt structural transitions observed in micron-sized powders become broad as particle size is reduced to a few tens of nanometers. The orthorhombic phase (Amm2) is observed in the range of 10-388 K, coexisting with the rhombohedral phase (R3c) at lower temperatures and with the tetragonal phase (P4mm) at higher temperatures. At room temperature (300 K), polystyrene-capped BaTiO3 nanoparticles, both 11 and 27 nm sizes, primarily adopt the tetragonal phase, transforming to the cubic phase ( Pm3m) at 398 K during heating. The phase evolution of the nanoparticles correlates well with their dielectric behavior. With the Landauer-Bruggeman effective approximation, the dielectric properties at room temperature for the BaTiO3 core were calculated and the results are in agreement with the size effect of BaTiO3 nanocrystals.

This is a manuscript of an article from Journal of Materials Chemistry 22, 23944-23951 (2012). DOI: 10.1039/c2jm35600g. Posted with permission.

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Guo, et al.
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H.Z. Guo, Yaroslav Mudryk, M.I. Ahmad, X.C. Pang, et al.. "Structure Evolution and Dielectric Behavior of Polystyrene-Capped Barium Titanate Nanoparticles" Journal of Materials Chemistry Vol. 22 (2012) p. 23944 - 23951
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