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Amortization And Dynamic Recovery Of A2BO4Structure Types During 1.5 MeV Krypton Ion-Beam Irradiation

Published online by Cambridge University Press:  15 February 2011

L. M. Wang ,
W. L. Gong  and
R. C. Ewing
L. M. Wang
Affiliation:
Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131
W. L. Gong
Affiliation:
Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131
R. C. Ewing
Affiliation:
Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131
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Abstract

The temperature dependence of the critical amorphization dose,Dc, of four A2BO4 compositions, forsterite (Mg2SiO4), fayalite(Fe2SiO4), synthetic Mg2GeO4,and phenakite (Be2SiO4) was investigated by in situ TEM during 1.5 MeV Kr+ion beam irradiation attemperatures between 15 to 700 K. For the Mg- and Fe-compositions, theA-site is in octahedral coordination, and the structure is a derivative hep (Pbnm); for the Be-composition, the A- and B-sitesare in tetrahedral coordination, forming corner-sharing hexagonal rings(R3). Although the Dc's were quite close at 15 K for all the fourcompositions (0.2–0.5 dpa), Dc increased with increasingirradiation temperature at different rates. The Dc-temperaturecurve is the result of competition between amorphization and dynamicrecovery processes. The Dc rate of increase (highest to lowest)is: Be2SiO4, Mg2SiO4, Mg2GeO4, Fe2SiO4. At roomtemperature, Be2SiO4 amorphized at 1.55 dpa; Fe2SiO4, at only 0.22 dpa. Based on the Dc-temperature curves, the activation energy, Ea,of the dynamic recovery process and the critical temperature, Tc,above which complete amorphization does not occur are: 0.029, 0.047, 0.055and 0.079 eV and 390, 550, 650 and 995 K for Be2SiO4, Mg2SiO4, Mg2GeO4 and Fe2SiO4, respectively. These results are explainedin terms of the materials properties (e.g., bonding and thermodynamicstability) and cascade size which is a function of the density of thephases. Finally, we note the importance of increased amorphizationcross-section, as a function of temperature (e.g., the low rate of increaseof Dc with temperature for Fe2SiO4).

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References

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