Abstract
The macroscopic swelling from alpha-decay events in Pu-doped ZrSiO4, natural ZrSiO4 minerals, and Cm-doped Ca2Nd8(SiO4)6O2 is interpreted in terms of both unit-cell expansion from defect accumulation and the volume change that occurs as the local crystal structure and long-range order collapse during amorphization. The derived amorphous fraction in ZrSiO4 as a function of cumulative alpha-decay events is consistent with models based on the multiple overlap of displacement cascades, suggesting that amorphization in ZrSiO4 occurs as a result of the local accumulation of high-defect concentrations. In Ca2Nd8(SiO4)6O2, on the other hand, the rate of amorphization is higher and the derived amorphous fraction as a function of cumulative alpha-decay events is consistent with amorphization occurring directly within the displacement cascade.
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