Ion irradiation damage in ilmenite under cryogenic conditions

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Description

A natural single crystal of ilmenite was irradiated at 100 K with 200 keV Ar{sup 2+}. Rutherford backscattering spectroscopy and ion channeling with 2 MeV He{sup +} ions were used to monitor damage accumulation in the surface region of the implanted crystal. At an irradiation fluence of 1 {times} 10{sup 15} Ar{sup 2+} cm{sup {minus}2}, considerable near-surface He{sup +} ion dechanneling was observed, to the extent that ion yield from a portion of the aligned crystal spectrum reached the yield level of a random spectrum. This observation suggests that the near-surface region of the crystal was amorphized by the implantation. ... continued below

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15 p.

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Mitchell, J.N.; Yu, N.; Devanathan, R.; Sickafus, K.E.; Nastasi, M.A. & Nord, G.L. Jr. November 1, 1996.

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Description

A natural single crystal of ilmenite was irradiated at 100 K with 200 keV Ar{sup 2+}. Rutherford backscattering spectroscopy and ion channeling with 2 MeV He{sup +} ions were used to monitor damage accumulation in the surface region of the implanted crystal. At an irradiation fluence of 1 {times} 10{sup 15} Ar{sup 2+} cm{sup {minus}2}, considerable near-surface He{sup +} ion dechanneling was observed, to the extent that ion yield from a portion of the aligned crystal spectrum reached the yield level of a random spectrum. This observation suggests that the near-surface region of the crystal was amorphized by the implantation. Cross-sectional transmission electron microscopy and electron diffraction on this sample confirmed the presence of a 150 mm thick amorphous layer. These results are compared to similar investigations on geikielite (MgTiO{sub 3}) and spinel (MgAl{sub 2}O{sub 4}) to explore factors that may influence radiation damage response in oxides.

Physical Description

15 p.

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INIS; OSTI as DE97000348

Source

  • IBMM `96: 10. international conference on ion beam modification of materials, Albuquerque, NM (United States), 1-6 Sep 1996

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  • Other: DE97000348
  • Report No.: LA-UR--96-3390
  • Report No.: CONF-960994--11
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/392836 | External Link
  • Office of Scientific & Technical Information Report Number: 392836
  • Archival Resource Key: ark:/67531/metadc685545

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  • November 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 29, 2016, 9:28 p.m.

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Mitchell, J.N.; Yu, N.; Devanathan, R.; Sickafus, K.E.; Nastasi, M.A. & Nord, G.L. Jr. Ion irradiation damage in ilmenite under cryogenic conditions, report, November 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc685545/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.