Neutron irradiation induced amorphization of uranium silicides

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Time-of-flight neutron powder diffraction studies of incrementally neutron-irradiated U{sub 3}Si and U{sub 3}Si{sub 2} have revealed details of progressive amorphization of bulk materials, crystalline transformation prior to amorphization, elastic strain and diffuse scattering resulting from scattering interference between crystalline and amorphous fractions. Density differences between amorphous and crystalline fractions give rise, respectively, to tensile and compressive strain in U{sub 3}Si and U{sub 3}Si{sub 2}. Diffuse scattering associated with each Bragg peak shows crystallographic direction-dependent variation both in magnitude and displacement (relative to the Bragg position). A theoretical model describing this behavior relates the size of the amorphous zones, and the ... continued below

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11 p.

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Richardson, J.W. Jr.; Birtcher, R.C. & Chan, S.K. October 1, 1997.

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Time-of-flight neutron powder diffraction studies of incrementally neutron-irradiated U{sub 3}Si and U{sub 3}Si{sub 2} have revealed details of progressive amorphization of bulk materials, crystalline transformation prior to amorphization, elastic strain and diffuse scattering resulting from scattering interference between crystalline and amorphous fractions. Density differences between amorphous and crystalline fractions give rise, respectively, to tensile and compressive strain in U{sub 3}Si and U{sub 3}Si{sub 2}. Diffuse scattering associated with each Bragg peak shows crystallographic direction-dependent variation both in magnitude and displacement (relative to the Bragg position). A theoretical model describing this behavior relates the size of the amorphous zones, and the magnitude and displacement of the diffuse scattering contribution. After complete amorphization of U{sub 3}Si and U{sub 3}Si{sub 2}, anneals to progressively higher temperatures generate gradual evolution of the short- to intermediate-range amorphous structures prior to re-crystallization.

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11 p.

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OSTI as DE98000641

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  • International conference on neutron scattering (ICNS), Toronto (Canada), 17-21 Aug 1997

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  • Other: DE98000641
  • Report No.: ANL/IPNS/CP--93199
  • Report No.: CONF-970814--
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 542003
  • Archival Resource Key: ark:/67531/metadc692836

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  • October 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 16, 2015, 5:13 p.m.

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Richardson, J.W. Jr.; Birtcher, R.C. & Chan, S.K. Neutron irradiation induced amorphization of uranium silicides, article, October 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc692836/: accessed April 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.