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See detailMineralogy and crystal chemistry of natural and synthetic uranyl oxysalts
Dal Bo, Fabrice ULg

Doctoral thesis (2016)

Since 1960, the number of described uranyl mineral species has been multiplied by three. To date more than 200 mineral species containing uranium as a main structural element are reported in Nature, and ... [more ▼]

Since 1960, the number of described uranyl mineral species has been multiplied by three. To date more than 200 mineral species containing uranium as a main structural element are reported in Nature, and the crystal structures have been determined and refined for only one third of them. Furthermore, many new uranyl minerals are still reported to data, showing sometimes novel chemical compositions and structural arrangements. The uranium mineralogy is a fascinating subject, and an essential field of research as it contributes to the improvement of the management techniques of nuclear waste. The first part of this work was dedicated to the mineralogical characterisation of uranyl minerals, and especially of the autunite-type minerals, occurring in the Rabejac deposit. Indeed, the identification analyses have shown that many samples contain uranyl arsenates of the autunite and meta-autunite groups. Electron-microprobe chemical analyses performed on these minerals species indicate that the P content in (meta-)zeunerite and (meta-)uranospinite is significant in several samples, confirming the solid-solution series between uranyl arsenates and phosphates. Also, cationic substitutions occurring on the A site were observed, especially in uranospinite samples, in which significant amount of Ca is substituted for Mg. Single-crystal X-ray diffraction experiments have been performed on many members of the (meta-)zeunerite-(meta-)torbernite series, and the crystallographic parameters were put into correlation with the variation of the chemical composition. The crystal structure of arsenuranospathite, the Asanalogue of the Al-bearing uranyl phosphate uranospathite, was solved for the first time, indicating that these two minerals are isostructural (Dal Bo et al., 2015). Also, a structure model is proposed for metauranocircite-I, one of the Ba-bearing uranyl phosphate of the meta-autunite group. Investigations of uranyl mineral samples from other localities have allowed to discover single-crystals of bassetite, one of the Fe end-members of the autunite group. The crystal structure of bassetite was also solved for the first time, and these new structural data were presented in parallel to those obtained on saléeite, the Mg-analogue of bassetite (Dal Bo et al., 2016). Thanks to these new data, a discussion about the mineral hierarchy of the (meta-)autunite group is proposed. In addition, the crystal structure of the rare Al-bearing uranyl phosphate furongite from the Kobokobo pegmatite was determined, showing that this mineral species has unique and novel structural features. This specific study, as well as the redefinition of the structural formula of phuralumite, was the occasion to provide a review about the formation of Al polyhedra clusters in uranyl minerals, and to try to elucidate their physicochemical conditions of crystallisation. Many new crystallographic data were also collected on uranyl minerals for which the crystal structure was already reported in the literature. Therefore, it was possible to confirm the previous studies, or to highlight important discrepancies, especially in the case of the Al-bearing uranyl phosphate phuralumite. The H-bonds networks, which are essential for the stability of the structure, have been established in the structure of the uranyl carbonate liebigite, and in the structure of the uranyl silicates cuprosklodowskite, kasolite and soddyite. The second part of this work was devoted to the hydrothermal synthesis of uranyl oxysalts. The experimental conditions, as well as the chemical systems, were chosen in agreement with the conditions occurring in natural uranium deposits, or in geological repositories. A new compound, Be[(UO2)(PO4)]2(H2O)2.5, has been synthesized at low temperature. This is the third Be-bearing uranyl phosphate reported to date, and its crystal structure is based upon sheets showing the uranophane anion topology, typical of uranyl silicates occurring in the oxidation zone of the uranium deposits. The well-known Ba[(UO2)3(MoO4)4(H2O)](H2O)3 and (NH4)2[(UO2)(MoO4)2](H2O) compounds have been synthesized, and new crystallographic data were collected on them. In addition, it was possible to determine the hydrogen-bonds networks for the first compound, and to redefine the Mo6+ coordination polyhedra in the second one. [less ▲]

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See detailNew crystallographic data on several uranyl minerals
Dal Bo, Fabrice ULg; Hatert, Frédéric ULg; Philippo, Simon

Conference (2016, September 04)

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See detailCrystal structure of bassetite and saléeite: new insight into autunite-group minerals
Dal Bo, Fabrice ULg; Hatert, Frédéric ULg; Mees, Florias et al

in European Journal of Mineralogy (2016)

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See detailCrystal structure of arsenuranospathite from Rabejac, Lodève, France
Dal Bo, Fabrice ULg; Hatert, Frédéric ULg; Baijot, Maxime ULg et al

in European Journal of Mineralogy (2015), 27

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See detailArrojadite-(BaNa), BaNa3(Na,Ca)Fe2+13Al(PO4)11(PO3OH)(OH)2, a new phosphate mineral from the Luna Albite pegmatite, Dorio commune, Lecco province, Italy.
Vignola, P; Hatert, Frédéric ULg; Baijot, Maxime ULg et al

in 7th International Symposium on Granitic Pegmatites- PEG 2015, Abstract book (2015)

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See detailCrystal Chemistry of Synthetic M(2+)Be2P2O8 (M(2+) = Ca, Sr, Pb, Ba) Beryllophosphates
Dal Bo, Fabrice ULg; Hatert, Frédéric ULg; Baijot, Maxime ULg

in Canadian Mineralogist (2014), 52(2), 337-350

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See detailA new nomenclature scheme for the alluaudite supergroup.
Hatert, Frédéric ULg; Baijot, Maxime ULg; Dal Bo, Fabrice ULg

in IMA 2014 – International Mineralogical Association, Abstract book (2014)

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See detailOccurrence of tellurides in the Stavelot Massif, Belgium.
Hatert, Frédéric ULg; Baijot, Maxime ULg; Dal Bo, Fabrice ULg

in IMA 2014 – International Mineralogical Association”, Abstract book, 131. (2014)

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See detailStrontiohurlbutite, SrBe2(PO4)2, a new mineral from Nanping no. 31 pegmatite, Fujian Province, Southeastern China
Rao, C; Wang, R; Hatert, Frédéric ULg et al

in American Mineralogist (2014), 99

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See detailStructural variations of olivine-type phosphates : a good example of how minerals can inspire the development of new materials.
Hatert, Frédéric ULg; Dal Bo, Fabrice ULg; Baijot, Maxime ULg

in ECM 28-28th European Crystallographic Meeting, Abstract book (2013, August)

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See detailThe structural complexity of phosphates in the Li-Fe2+-Fe3+ (+ PO4) system
Dal Bo, Fabrice ULg; Hatert, Frédéric ULg

Conference (2012, September 03)

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See detailLi0.97Fe(II)0.79Fe(III)0.15(PO4), a new oxidized triphylite-type phosphate
Dal Bo, Fabrice ULg; Hatert, Frédéric ULg

in Acta Crystallographica Section C-Crystal Structure Communications (2012), C68

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See detailFe(II)2.67Fe(III)4(PO4)5.35(HPO4)0.65 and Fe(II)2.23Fe(III)4(PO4)4.45(HPO4)1.55, two new mixed-valence iron phosphates.
Dal Bo, Fabrice ULg; Hatert, Frédéric ULg

in Acta Crystallographica Section C-Crystal Structure Communications (2012), C68

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