Neutron scattering characterization of pure and rare-earth modified zirconia catalysis.

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The combined application of neutron powder diffraction, small angle neutron scattering and neutron inelastic scattering has led to improved understanding of the crystal phases, defect structure, microstructure and hydroxyl/water dynamics in pure and lanthanide-modified zirconia catalysts. Powder diffraction experiments quantified the degree of stabilization and provided evidence for static, oxygen vacancy-induced atomic displacements in stabilized zirconia. Quantitative assessment of Bragg peak breadths led to measurements of ''grain size'', representing coherency length of long-range ordered atomic arrangements (crystals). Small angle neutron scattering provided a separate measurement of ''grain size'', representing the average size of the primary particles in the aggregates, and ... continued below

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10 p.

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Loong, C.-K.; Ozawa, M.; Richardson, J. W., Jr.; Suzuki, S. & Thiyagarajan, P. November 18, 1997.

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Description

The combined application of neutron powder diffraction, small angle neutron scattering and neutron inelastic scattering has led to improved understanding of the crystal phases, defect structure, microstructure and hydroxyl/water dynamics in pure and lanthanide-modified zirconia catalysts. Powder diffraction experiments quantified the degree of stabilization and provided evidence for static, oxygen vacancy-induced atomic displacements in stabilized zirconia. Quantitative assessment of Bragg peak breadths led to measurements of ''grain size'', representing coherency length of long-range ordered atomic arrangements (crystals). Small angle neutron scattering provided a separate measurement of ''grain size'', representing the average size of the primary particles in the aggregates, and the evolution of porosity (micro- versus meso-) and surface roughness caused by RE modification and heat treatment. Finally, the dynamics of hydrogen atoms associated with surface hydroxyls and adsorbed water was investigated by neutron-inelastic scattering, revealing changes in frequency and band breadth of O-H stretch, H-O-H bend, and librational motion of water molecules.

Physical Description

10 p.

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OSTI as DE00008881

Medium: P; Size: 10 pages

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  • 46th Annual Denver X-Ray Conference, Steam Boat Springs, CO (US), 08/04/1997--08/08/1997

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  • Report No.: ANL/IPNS/CP-94846
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 8881
  • Archival Resource Key: ark:/67531/metadc794204

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Office of Scientific & Technical Information Technical Reports

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  • November 18, 1997

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  • Dec. 19, 2015, 7:14 p.m.

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  • April 6, 2017, 6:48 p.m.

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Loong, C.-K.; Ozawa, M.; Richardson, J. W., Jr.; Suzuki, S. & Thiyagarajan, P. Neutron scattering characterization of pure and rare-earth modified zirconia catalysis., article, November 18, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc794204/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.