Evidence of the contrasted fission-track clock behavior of the apatites from In Ouzzal carbonatites (northwest Hoggar): The low-temperature thermal history of an Archean basement

Carpéna, J.; Kiénast, Jean-Robert; Ouzegane, Khadidja; Jèhanno, C.

doi:10.1130/0016-7606(1988)100<1237:eotcft>2.3.co;2

Cited by 61 publications

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“…The Raman spectra of 243 , etc., and Y = F À , OH À , Cl À , etc., showed greater irradiation sensitivity at higher SiO 4 /PO 4 ratios [52]. Studies of natural apatite also showed that minerals with high silicate content are more sensitive to irradiation [53]. Soulet attributes this result to the fact that the phosphate group in the structure favors annealing of the matrix by alpha irradiation [52].…”

Section: Irradiation Stability Of the Phosphate Group?mentioning

confidence: 99%

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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Section: Irradiation Stability Of the Phosphate Group?mentioning

confidence: 99%

Ion beam radiation effects in monazite

Picot

Deschanels

Peuget

et al. 2008

Journal of Nuclear Materials

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“…Indeed, in natural apatites (particularly those coming from the Oklo fossil nuclear reactors -Gabon), the structure has been able to accept a large variety of cationic substitutions, leading to the simultaneous incorporation of lanthanides, thorium and uranium [19,20]. Furthermore, some samples of silicate-based apatite (britholites) of In Ouzzal site (Algeria) were found to contain up to 50 wt% of actinides (U, Th) [21].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of uranium-bearing britholites

Terra

Audubert

Dacheux

et al. 2007

Journal of Nuclear Materials

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“…Indeed, in natural apatites, particularly those coming from the Oklo fossil nuclear reactors (Gabon), the structure was able to immobilize over the lanthanides, a large variety of cationic substitution (as example by U, Th, Pu) [3,4]. Silicate based apatite samples (britholites) of In Ouzzal site (Algeria) contain up to 50 wt.% of trivalent lanthanides (La, Ce, Nd) and tetravalent actinides (U, Th) [5]. Moreover, the apatitic structure seems to be able to anneal the defects generated by self-irradiation, even at low temperature [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of thorium-bearing britholites

Terra

Audubert

Dacheux

et al. 2006

Journal of Nuclear Materials

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In the field of the immobilization of tri-and tetravalent minor actinides, apatites and especially britholites were already proposed as good candidates. In order to simulate tetravalent minor actinides, the incorporation of thorium, through dry chemical routes, was studied in britholite samples of general formula Ca 9 Nd 1-x Th x (PO 4 ) 5-x (SiO 4 ) 1+x F 2 . The study showed that the incorporation of thorium was effective whatever the thorium reagent used or the grinding conditions considered. Nevertheless, it appeared necessary to use mechanical grinding (30 Hz, 15 minutes) before heating treatment (T = 1400°C, 6 hours) to improve the reactivity of powders and the sample homogeneity. In these conditions, the incorporation of thorium in the britholite structure occurred above 1100°C. The heating treatment at 1400°C led to single phase and homogeneous compounds. This work also underlined the necessity to prefer the coupled substitution (Nd 3+ , PO 4 3-) ⇔ (Th 4+ , SiO 4 4-) instead of (Nd 3+ , F -) ⇔ (Th 4+ , O 2-), in order to prepare pure and single phase samples in all the range of composition examined.3

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Evidence of the contrasted fission-track clock behavior of the apatites from In Ouzzal carbonatites (northwest Hoggar): The low-temperature thermal history of an Archean basement

Cited by 61 publications

References 0 publications

Ion beam radiation effects in monazite

Ion beam radiation effects in monazite

Synthesis and characterization of uranium-bearing britholites

Synthesis and characterization of thorium-bearing britholites

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