In situ TEM study of ion-beam-induced amorphization of complex silicate structures
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.
- Research Organization:
- New Mexico Univ., Albuquerque, NM (United States). Dept. of Geology
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- FG04-84ER45099
- OSTI ID:
- 442204
- Report Number(s):
- CONF-900936-29; ON: DE97002504
- Resource Relation:
- Conference: 7. international conference on ion beam modification of materials (IBMM-7) and exposition, Knoxville, TN (United States), 9-14 Sep 1990; Other Information: PBD: [1990]
- Country of Publication:
- United States
- Language:
- English
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