Direct synthesis of pure brannerite UTi2O6

JOURNAL OF NUCLEAR MATERIALS

卷:515

Article

Mesbah, Adel¹  Szenknect, Stephanie¹  Clavier, Nicolas¹  Lin, Hantao¹  Baron, Fabien²  Beaufort, Daniel³  Batonneau, Yann³  Mercadier, Julien⁴  Eglinger, Aurelien⁴  Turuani, Marion⁵  Goncalves, Philippe⁵  Choulet, Flavien⁵  Chapon, Virginie⁶  Seydoux-Guillaume, Anne-Magali⁷  Pagel, Maurice⁸  Dacheux, Nicolas¹ 

[1] Univ Montpellier, CEA, CNRS, ICSM,ENSCM, Site Marcoule,Bat 426,BP 17171, Bagnols Sur Ceze, France

[2] Univ Nantes, CNRS, Lab Planetol & Geodynam, 2 Rue Houssiniere, F-44322 Nantes, France

[3] Univ Poitiers, CNRS UMR 7285 IC2MP, HydrASA Bat B35,Rue Michel Brunet, F-86022 Poitiers, France

[4] Univ Lorraine, CNRS, CREGU, GeoRessources Lab, BP 70239, F-54506 Vandoeuvre Les Nancy, France

[5] Univ Bourgogne Franche Comte, CNRS, UMR 6249, Chronoenvironm, Besancon, France

[6] Aix Marseille Univ, CEA, CNRS, UMR Biol Vegetale & Microbiol Environm 7265,Lab I, St Paul Les Durance, France

[7] Univ Lyon, UJM St Etienne, CNRS, UCA,IRD,LMV UMR 6524, St Etienne, France

[8] Univ Paris Saclay, CNRS, Univ Paris Sud, GEOPS, Rue Blvd,Bat 504, F-91405 Orsay, France

关键词: Brannerite;    Uranium titanate;    Uranium hydroxide;   

DOI  :  10.1016/j.jnucmat.2019.01.003

来源: Elsevier

【 摘 要 】

A new method based on the precipitation of uranium(IV) and titanium(IV) hydroxide precursors was developed to prepare pure brannerite UTi2O6 samples. In fact, U(IV) dissolved in HCl (6 mol L-1) was mixed to Ti (IV) alkoxyde before a basification step with an excess of NH4OH to obtain a highly reactive nanometric (U,Ti)(OH)(4) powder. The obtained powder was then dried under vacuum, pressed into pellets and finally fired at 1300 degrees C. This method led to the formation of pure brannerite in contrast to previous reported protocols, which showed the formation of impurities such us UO2 and TiO2. The refined unit cell parameters of UTi2O6 led to a = 9.8113(2) angstrom, b = 3.7681(1) angstrom, c = 6.9232(1) angstrom, beta = 118.94(1)degrees and V = 223.9(1) angstrom(3). (C) 2019 Elsevier B.V. All rights reserved.

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