Formation of a metastable crystalline phase during ion irradiation of spinel

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We have examined the radiation resistance of magnesio-aluminate spinel by irradiating single crystals of MgAl{sub 2}O{sub 4} with 400 keV Xe++ions at 100 K. At low irradiation doses, the material transformed into a metastable crystalline phase with half the lattice spacing of the original crystal. Electron diffraction analysis revealed that this structural change can be explained in terms of the redistribution of cations among octahedral, tetrahedral, and three- fold coordinated interstitial sites of the close-packed anion lattice. Corresponding to this transformation, the hardness and elastic modulus increased with dose to values about 10% greater than those of unirradiated spinel. We ... continued below

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7 p.

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Devanathan, R.; Yu, Ning; Sickafus, K. & Nastasi, M. December 31, 1995.

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We have examined the radiation resistance of magnesio-aluminate spinel by irradiating single crystals of MgAl{sub 2}O{sub 4} with 400 keV Xe++ions at 100 K. At low irradiation doses, the material transformed into a metastable crystalline phase with half the lattice spacing of the original crystal. Electron diffraction analysis revealed that this structural change can be explained in terms of the redistribution of cations among octahedral, tetrahedral, and three- fold coordinated interstitial sites of the close-packed anion lattice. Corresponding to this transformation, the hardness and elastic modulus increased with dose to values about 10% greater than those of unirradiated spinel. We believe that the formation of this metastable phase plays an important role in determining the radiation resistance of spinel.

Physical Description

7 p.

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INIS; OSTI as DE96006334

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 27 Nov - 1 Dec 1995

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  • Other: DE96006334
  • Report No.: LA-UR--95-4394
  • Report No.: CONF-951155--57
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 205644
  • Archival Resource Key: ark:/67531/metadc668113

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  • December 31, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 29, 2016, 3:12 p.m.

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Devanathan, R.; Yu, Ning; Sickafus, K. & Nastasi, M. Formation of a metastable crystalline phase during ion irradiation of spinel, article, December 31, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc668113/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.