Swelling induced by alpha decay in monazite and zirconolite ceramics: A XRD and TEM comparative study

Deschanels, Xavier; Seydoux‐Guillaume, Anne‐Magali; Magnin, Valérie; Mesbah, Adel; Tribet, M.; Moloney, Maria; Serruys, Y.; Peuget, S.

doi:10.1016/j.jnucmat.2014.02.003

Cited by 49 publications

(63 citation statements)

References 48 publications

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“…Ionic radii also influence the crystal structure and morphology. Although the previous studies have reported on the mineralogical properties of all four types of RE phosphates and their application to accommodate foreign cations [17,18], these studies were mainly concerned with the well-crystalline phase formed at elevated temperatures at acidic pH~1, e.g., [16,19]. The crystal chemical property of the hydrous RE phosphates that formed at ambient temperature has not the number of protons that would be released to the solution during the reaction.…”

Section: Introductionmentioning

confidence: 99%

Crystal Chemistry and Stability of Hydrated Rare-Earth Phosphates Formed at Room Temperature

Ochiai

Utsunomiya

2017

Minerals

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Abstract:In order to understand the crystal chemical properties of hydrous rare-earth (RE) phosphates, REPO 4,hyd , that form at ambient temperature, we have synthesized REPO 4,hyd through the interaction of aqueous RE elements (REEs) with aqueous P at room temperature at pH < 6, where the precipitation of RE hydroxides does not occur, and performed rigorous solid characterization. The second experiment was designed identically except for using hydroxyapatite (HAP) crystals as the P source at pH constrained by the dissolved P. Hydrated RE phosphate that precipitated at pH 3 after 3 days was classified into three groups: LREPO 4,hyd (La → Gd) containing each REE from La-Gd, MREPO 4,hyd (Tb → Ho), and HREPO 4,hyd (Er → Lu). The latter two groups included increasing fractions of an amorphous component with increasing ionic radius, which was associated with non-coordinated water. RE all PO 4,hyd that contains all lanthanides except Pm transformed to rhabdophane structure over 30 days of aging. In the experiments using HAP, light REEs were preferentially distributed into nano-crystals, which can potentially constrain initial RE distributions in aqueous phase. Consequently, the mineralogical properties of hydrous RE phosphates forming at ambient temperature depend on the aging, the pH of the solution, and the average ionic radii of REE, similarly to the well-crystalline RE phosphates.

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Section: Introductionmentioning

confidence: 99%

Crystal Chemistry and Stability of Hydrated Rare-Earth Phosphates Formed at Room Temperature

Ochiai

Utsunomiya

2017

Minerals

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“…Three Focused Ion Beam (FIB) foils were prepared (method descriptions in Deschanels et al, 2014) from one zircon crystal included in feldspar (Fig. 1B) and one foil from a zircon crystal included in xenotime (Fig.…”

Section: Sample and Resultsmentioning

confidence: 99%

Nanoscale evidence for uranium mobility in zircon and the discordance of U–Pb chronometers

Seydoux‐Guillaume

Bingen

Paquette

et al. 2015

Earth and Planetary Science Letters

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“…As observed for other phosphate -based ceramics like β-PDT or britholite, the behavior of cheralite under irradiation is governed by two opposite effects: creation of structural defects by alpha particles and self-annealing at relatively low temperature [74,75]. Thus, the cheralite structure remains crystalline as long as the creation of defects is entirely compensated by self-annealing.…”

Section: Behavior Of M Ii M′ Iv (Po 4 ) 2 Compounds In Nuclear Contextmentioning

confidence: 85%

“…Moreover, U-and Th-cheralite and cheralite/monazite solid solutions can be sintered at lower temperature compared to pure monazite ceramics [8,[69][70][71][72][73][74][75][76][77][78][79].…”

Section: Behavior Of M Ii M′ Iv (Po 4 ) 2 Compounds In Nuclear Contextmentioning

confidence: 99%

Crystal chemistry of MIIM′IV(PO4)2 double monophosphates

Brégiroux

Popa

Wallez

2015

Journal of Solid State Chemistry

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a b s t r a c t M II M′ IV (PO 4 ) 2 compounds have been extensively studied for several decades for their potential applications in the field of several domains such as matrices for actinides conditioning, phosphors etc. In this paper, the relationships between composition and crystal structure of these compounds are established. A review of the various processes used for the synthesis of these compounds is also proposed, as well as their most reported properties. M II M′ IV (PO 4 ) 2 structures stem from two different archetypes: the cheralite and the yavapaiite structures, with some exceptions that are also described in this article. The ratio of the cations radii appears to be the most relevant parameter. The high ratio between the ionic radii of the divalent and tetravalent cations in yavapaiite derivates results in the ordering of these cations into well-differentiated polyhedra whereas cheralite is the only non-ordered structure encountered for M II M′ IV (PO 4 ) 2 compounds.

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Swelling induced by alpha decay in monazite and zirconolite ceramics: A XRD and TEM comparative study

Cited by 49 publications

References 48 publications

Crystal Chemistry and Stability of Hydrated Rare-Earth Phosphates Formed at Room Temperature

Crystal Chemistry and Stability of Hydrated Rare-Earth Phosphates Formed at Room Temperature

Nanoscale evidence for uranium mobility in zircon and the discordance of U–Pb chronometers

Crystal chemistry of MIIM′IV(PO4)2 double monophosphates

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