In situ TEM study of ion-beam-induced amorphization of complex silicate structures

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In-situ TEM with ion irradiation was used to study the radiation- induced amorphization (metamictization) of naturally occurring silicates: neptunite [Na2KLi(Fe,Mn)2Ti2(SiO3)8], titanite (CaTiSiO5), gadolinite (REE2FeBe2Si2O10), zircon (ZrSiO4), and olivine [(Mg, Fe)2SiO4]. They were irradiated with 1.5 MeV Kr{sup +} ions the Argonne HVEM-Tandem Facility at room temperature with electron diffraction pattern monitored in situ. Critical doses required for amorphization of the electron transparent thickness of neptunite, titanite, gadolinite, zircon, and olivine are 1.7, 2.0, 2.3, 4.8, and 6.0x10{sup 14} ions/cm{sup 2}, respectively. Results show a correlation between amorphization dose and the chemical/structural complexity of these 5 minerals. The most complex, neptunite, ... continued below

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12 p.

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Wang, L.M.; Eby, R.K.; Janeczek, J. & Ewing, R.C. December 31, 1990.

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In-situ TEM with ion irradiation was used to study the radiation- induced amorphization (metamictization) of naturally occurring silicates: neptunite [Na2KLi(Fe,Mn)2Ti2(SiO3)8], titanite (CaTiSiO5), gadolinite (REE2FeBe2Si2O10), zircon (ZrSiO4), and olivine [(Mg, Fe)2SiO4]. They were irradiated with 1.5 MeV Kr{sup +} ions the Argonne HVEM-Tandem Facility at room temperature with electron diffraction pattern monitored in situ. Critical doses required for amorphization of the electron transparent thickness of neptunite, titanite, gadolinite, zircon, and olivine are 1.7, 2.0, 2.3, 4.8, and 6.0x10{sup 14} ions/cm{sup 2}, respectively. Results show a correlation between amorphization dose and the chemical/structural complexity of these 5 minerals. The most complex, neptunite, becomes amorphous at the lowest critical dose. The critical amorphization dose also increases with the melting point.

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12 p.

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OSTI as DE97002504

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  • 7. international conference on ion beam modification of materials (IBMM-7) and exposition, Knoxville, TN (United States), 9-14 Sep 1990

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  • Other: DE97002504
  • Report No.: CONF-900936--29
  • Grant Number: FG04-84ER45099
  • Office of Scientific & Technical Information Report Number: 442204
  • Archival Resource Key: ark:/67531/metadc681352

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  • December 31, 1990

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  • July 25, 2015, 2:21 a.m.

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  • Nov. 6, 2015, 3:15 p.m.

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Wang, L.M.; Eby, R.K.; Janeczek, J. & Ewing, R.C. In situ TEM study of ion-beam-induced amorphization of complex silicate structures, article, December 31, 1990; United States. (digital.library.unt.edu/ark:/67531/metadc681352/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.