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Size-effect Stabilization of the Low-T Ferroelectric Phase in Nanocrystalline WO3

Published online by Cambridge University Press:  21 February 2011

Xiang-Xin Bi ,
W. T. Lee ,
Kai-An Wang ,
D. F. Collins ,
S. Bandow  and
P. C. Eklund
Xiang-Xin Bi
Affiliation:
Center for Applied Energy Research, University of Kentucky, Lexington, KY40511-8433, USA
W. T. Lee
Affiliation:
Center for Applied Energy Research, University of Kentucky, Lexington, KY40511-8433, USA
Kai-An Wang
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, KY40511-8433, USA
D. F. Collins
Affiliation:
Department of Physics, Warren Wilson College, Asheville, NC 28815, USA
S. Bandow
Affiliation:
Instrument Center, Institute for Molecular Science, Myodaiji, Okazaki, 444, Japan
P. C. Eklund
Affiliation:
Center for Applied Energy Research, University of Kentucky, Lexington, KY40511-8433, USA Department of Physics and Astronomy, University of Kentucky, Lexington, KY40511-8433, USA
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Abstract

Using a CO2 laser to drive the pyrolysis of W(CO)6 and O2, we have synthesized nanocrystalline WO3-x particles. These nanopowders are found to exhibit a narrow size distribution with an average particle size produced in the range 5 to 10 nm, depending on the experimental conditions. Typical production rates are ∼ 2 g/h. Results from a Raman scattering study on WO3 nanopowder samples annealed in O2 indicate that a smaller particle size appears to stabilize the low-T ferroelectric phase ( < -40 °C) at room temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 332: Symposium U – Determining Nanoscale Physical Properties of Materials by Microscopy and Spectroscopy , 1994 , 531
Copyright
Copyright © Materials Research Society 1994

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References

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