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Accumulation of structural defects in ion-irradiated Ca2Nd8(SiO4)6O2

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Abstract

Ion irradiations of the rare-earth orthosilicate, Ca2Nd8(SiO4)6O2, have been carried out using both alpha particles (emitted from a 238PuO2 source) and 3 MeV argon ions. The unit cell exhibits anisotropic expansion under irradiation, consistent with expectations based on the polyhedral connectivity within the structure. A least-squares analysis of the interatomic distances suggests that the unit-cell expansions are primarily due to changes in oxygen-oxygen distances and cation separations between neighboring polyhedra rather than to bonds within polyhedra. The irradiation-induced change in unit-cell volume is proportional to 1 – exp (BD), where B is an annealing rate constant and D is the dose, in agreement with a model for the accumulation of isolated point defects in the structure. The volume expansion saturates at 2.56% and 1.40% for the alpha and argon irradiations, respectively. Analysis of the results suggests that a significant fraction of the defects produced in the argon-ion displacement cascades are lost to in-cascade recombination. Differential scanning calorimetry of powder irradiated with 3 MeV argon ions to 20 ions/nm2 reveals an exothermic recovery peak at 350 °C with an activation energy of 1.3 ± 0.1 eV and average stored energy release of 28.2 J/g. There is no evidence for amorphization of this material under alpha or argon irradiation.

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Authors and Affiliations

  1. Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington, 99352, USA

    W. J. Weber

  2. Department of Geology, University of New Mexico, Albuquerque, New Mexico, 87131, USA

    R. K. Eby & R. C. Ewing

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  1. W. J. Weber
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  2. R. K. Eby
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  3. R. C. Ewing
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Weber, W.J., Eby, R.K. & Ewing, R.C. Accumulation of structural defects in ion-irradiated Ca2Nd8(SiO4)6O2. Journal of Materials Research 6, 1334–1345 (1991). https://doi.org/10.1557/JMR.1991.1334

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  • DOI: https://doi.org/10.1557/JMR.1991.1334

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