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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Surfactant-free hydrothermal synthesis of highly tetragonal barium titanate nanowires: A structural investigation

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Title
Surfactant-free hydrothermal synthesis of highly tetragonal barium titanate nanowires: A structural investigation
Other Titles
Surfactant-free hydrothermal synthesis of highly tetragonal barium titanate nanowires: A structural investigation
Author
Joshi, Upendra A.Yoon, SonghakBaik, SunggiLee, Jae Sung
Keywords
DRIVEN PHASE-TRANSITION; ANOMALOUS LATTICE EXPANSION; ROOM-TEMPERATURE; PARTICLE-SIZE; FERROELECTRIC MEMORIES; NANOCRYSTALLINE BATIO3; DIELECTRIC-PROPERTIES; STRONTIUM-TITANATE; CRYSTAL-STRUCTURE; FINE PARTICLES
Issue Date
2006-06
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY B, v.110, no.25, pp.12249 - 12256
Abstract
Barium titanate nanowires synthesized with a surfactant-free hydrothermal method have been characterized by various techniques such as transmission electron microscopy (TEM), scanning electron microscopy (SEM), synchrotron X-ray diffraction, X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The TEM and SEM analyses show the uniform cylindrical nanowires. The Rietveld refinement with synchrotron X-ray powder diffraction showed that the lattice parameters of cubic and tetragonal phases were a (= b = c) = 4.0134 angstrom and a (= b) = 3.9998 angstrom, c = 4.0303 angstrom, respectively. The final weighted R-factor, R-wp, was 6.75% and the goodness of fit indicator was 1.30. The mass fraction of tetragonal and cubic phases based on the refined scale factor for the two phases were 98.4% and 1.6%, respectively, which clearly show the nanowires are tetragonal. The XPS analysis has shown that as-obtained BaTiO3 nanowires were phase pure. The Raman spectra confirm the tetragonal phase of the BaTiO3 nanowires. The dielectric constant measurement shows the shift in the transition temperature (T-c = 105 degrees C) compared to the bulk transition temperature (T-c = 132 degrees C). The dielectric constant at T-c was 174 measured at 1 kHz frequency
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DOI
10.1021/jp0600110
ISSN
1520-6106
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ECHE_Journal Papers
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