Microstructural characterization of iron implanted sapphire nanocomposites

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Nanocomposites of iron in sapphire ({alpha}-Al{sub 2}O{sub 3}) prepared by ion implantation have been studied as a model to investigate the potential of such materials for applications in high technology areas. The implantation was performed with 160 keV ions at several doses; the nanocomposites were then annealed at selected temperatures between 700 and 1,400 C in an Ar-4%H{sub 2} atmosphere for 1 hour. Rutherford backscattering spectroscopy and high resolution transmission electron microscopy (TEM) were used to characterize the structure of these nanocomposites. Measurements showed that damage depth extended to about 300 nm and the embedded iron extended to about 200 ... continued below

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6 p.

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Ren, S.X.; McHargue, C.J.; Allard, L.F.; Chen, Y.; Hunn, J.D.; Lucas, B.N. et al. December 31, 1994.

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Nanocomposites of iron in sapphire ({alpha}-Al{sub 2}O{sub 3}) prepared by ion implantation have been studied as a model to investigate the potential of such materials for applications in high technology areas. The implantation was performed with 160 keV ions at several doses; the nanocomposites were then annealed at selected temperatures between 700 and 1,400 C in an Ar-4%H{sub 2} atmosphere for 1 hour. Rutherford backscattering spectroscopy and high resolution transmission electron microscopy (TEM) were used to characterize the structure of these nanocomposites. Measurements showed that damage depth extended to about 300 nm and the embedded iron extended to about 200 nm. This region became amorphous when the fluence reaches 2 {times} 10{sup 17} Fe/cm{sup 2} at this energy. Thermal annealing could be used to restore the crystallinity to the damaged near-surface region, to form the metallic colloids, and also to coarsen the precipitates. In the case of high dose implantation, oriented precipitates with diameters of 2 to 3 nm were identified by TEM techniques as {alpha}-Fe which had the following orientation relationship with the sapphire matrix: <111>{sub Fe} {parallel} <310>{sub Sapphire} and {l_brace}01{bar 1}{r_brace}{sub Fe} {parallel} {l_brace}006{r_brace}{sub Sapphire}. The optical density and luminescence spectra were also measured. The predominant defects were oxygen vacancies with two electrons (F center) at the known absorption peak of 200 nm.

Physical Description

6 p.

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INIS; OSTI as DE95014260

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 28 Nov - 9 Dec 1994

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  • Other: DE95014260
  • Report No.: CONF-941144--170
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/102181 | External Link
  • Office of Scientific & Technical Information Report Number: 102181
  • Archival Resource Key: ark:/67531/metadc624598

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Creation Date

  • December 31, 1994

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Jan. 25, 2016, 8:04 p.m.

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Ren, S.X.; McHargue, C.J.; Allard, L.F.; Chen, Y.; Hunn, J.D.; Lucas, B.N. et al. Microstructural characterization of iron implanted sapphire nanocomposites, report, December 31, 1994; Tennessee. (digital.library.unt.edu/ark:/67531/metadc624598/: accessed May 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.