Ion beam induced amorphization of monazite

Meldrum, A.; Wang, L.M.; Ewing, Rodney C.

doi:10.1016/0168-583x(96)00037-7

Cited by 62 publications

(33 citation statements)

References 13 publications

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“…Amorphous domains are absent, only some misoriented regions interpreted as old ␣-recoil tracks, have been found. Two explanations are possible: (a) either the lattice can heal at such low temperatures, in accordance with experimental data (Meldrum et al, 1996(Meldrum et al, , 1997Ewing and Wang, 2002), or (b) ionization created by ␣-particles, or electrons from ␣-decay in the U and Th decay chains partially anneal structural damages created by the recoil of nuclei (Ouchani et al, 1997;Ewing and Wang, 2002;Harrison et al, 2002). Future experimental studies should focus on the healing mechanisms of monazite.…”

Section: Interpretation Of the Resultssupporting

confidence: 50%

Microstructure of 24-1928 Ma concordant monazites; implications for geochronology and nuclear waste deposits

Seydoux‐Guillaume

Wirth

Deutsch

et al. 2004

Geochimica et Cosmochimica Acta

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Section: Interpretation Of the Resultssupporting

confidence: 50%

Microstructure of 24-1928 Ma concordant monazites; implications for geochronology and nuclear waste deposits

Seydoux‐Guillaume

Wirth

Deutsch

et al. 2004

Geochimica et Cosmochimica Acta

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“…Soulet attributes this result to the fact that the phosphate group in the structure favors annealing of the matrix by alpha irradiation [52]. Meldrum [54,55] also reported that MPO 4 phosphate compounds are characterized by lower annealing temperatures and activation energies than MSiO 4 silicate compounds; he attributed this difference to P-O bonds, much stronger and shorter than Si-O bonds [24].…”

Section: Irradiation Stability Of the Phosphate Group?mentioning

confidence: 93%

Ion beam radiation effects in monazite

Picot

Deschanels

Peuget

et al. 2008

Journal of Nuclear Materials

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a b s t r a c tMonazite is a potential matrix for conditioning minor actinides arising from spent fuel reprocessing. The matrix behavior under irradiation must be investigated to ensure long-term containment performance. Monazite compounds were irradiated by gold and helium ions to simulate the consequences of alpha decay. This article describes the effects of such irradiation on the structural and macroscopic properties (density and hardness) of monazites LaPO 4 and La 0.73 Ce 0.27 PO 4 . Irradiation by gold ions results in major changes in the material properties. At a damage level of 6.7 dpa, monazite exhibits volume expansion of about 8.1%, a 59% drop in hardness, and structure amorphization, although Raman spectroscopy analysis shows that the phosphate-oxygen bond is unaffected. Conversely, no change in the properties of these compounds was observed after He ion implantation. These results indicate that ballistic effects predominate in the studied dose range.

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“…Electron irradiation produced during alpha decay may be an efficient way to anneal metamict monazite (Meldrum et al, 1997a). It has been suggested that the strong bonds between P and O and the low symmetry monazite structure may be responsible for the near total resistance of natural monazites to accumulating radiation damage (Cherniak et al, 1991;Cherniak, 1993;Krogstad and Walker, 1994;Meldrum et al, 1996Meldrum et al, , 1997b.…”

Section: Radiation Damagementioning

confidence: 99%