2019
DOI: 10.1016/j.jnucmat.2019.01.003
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Direct synthesis of pure brannerite UTi2O6

Abstract: 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 powder of a nanometric (U,Ti)(OH)4. The obtained powder was then dried under vacuum, pressed into pellets and finally fired at 1300°C. The refined unit cell parameters of UTi2O6 led to a = 9.8113(2) Å, b = 3.7681… Show more

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Cited by 14 publications
(14 citation statements)
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“…The relatively higher UO 2 content together with the excellent phase flexibility make it an attractive host phase for actinide waste management, especially for spent nuclear fuels. 17 As such its synthesis, 18 crystal chemistry, [19][20][21] aqueous durability, [22][23][24][25] vibrational modes, 26,27 stability under pressure, 28 radiation damage, 29,30 actinide valence states, [31][32][33] thermal recrystallization of amorphous natural samples, 34 as well as the incorporations of neptunium and plutonium (Pu) have been extensively studied. 35 A stable titanate-based brannerite requires an overall tetravalent charge on the A-site of brannerite (ATi 2 O 6 ).…”
Section: Introductionmentioning
confidence: 99%
“…The relatively higher UO 2 content together with the excellent phase flexibility make it an attractive host phase for actinide waste management, especially for spent nuclear fuels. 17 As such its synthesis, 18 crystal chemistry, [19][20][21] aqueous durability, [22][23][24][25] vibrational modes, 26,27 stability under pressure, 28 radiation damage, 29,30 actinide valence states, [31][32][33] thermal recrystallization of amorphous natural samples, 34 as well as the incorporations of neptunium and plutonium (Pu) have been extensively studied. 35 A stable titanate-based brannerite requires an overall tetravalent charge on the A-site of brannerite (ATi 2 O 6 ).…”
Section: Introductionmentioning
confidence: 99%
“…The Raman spectra of hydrothermal brannerite samples, acquired in unaltered domains (Fig. 3), do not exhibit the characteristic features of pure synthetic brannerite (Mesbah et al ., 2019). The Raman spectra of brannerite samples exhibit a small but significant feature at 151 cm –1 (only for the La Gardette sample) and broad and poorly resolved features around 600, 750 and 820 cm –1 (Fig.…”
Section: Resultsmentioning
confidence: 99%
“…A1), as similarly to hydrothermal brannerite, the Raman spectra acquired in unaltered domains (Fig. 6), do not exhibit the characteristic features of pure synthetic brannerite (Zhang et al , 2013; Mesbah et al ., 2019). Again, with the exception of the well-defined feature at 151 cm –1 , the sample from Namibia, only has broad and poorly resolved features around 600, 750 and 820 cm –1 (Fig.…”
Section: Resultsmentioning
confidence: 99%
“…Among them, many waste streams contain fission products and minor actinides with long half‐lives requiring immobilization in a stable solid form suitable for long‐term geological disposal 1–3 . Several types of chemically durable materials, for example, borosilicate glasses 4–6 and various crystalline mineral phases such as zirconolite, 7–12 pyrochlore, 13–17 and brannerite 18–21 have been extensively investigated as potential candidate wasteforms for such a purpose. In addition, many phosphate‐based ceramics such as monazite and xenotime, 22–28 britholite and apatite, 29–31 thorium phosphates, 32,33 cheralite and monazite‐cheralite solid solutions 34,35 have also been comprehensively studied.…”
Section: Introductionmentioning
confidence: 99%
“…pyrochlore, [13][14][15][16][17] and brannerite [18][19][20][21] have been extensively investigated as potential candidate wasteforms for such a purpose. In addition, many phosphate-based ceramics such as monazite and xenotime, [22][23][24][25][26][27][28] britholite and apatite, [29][30][31] thorium phosphates, 32,33 cheralite and monazite-cheralite solid solutions 34,35 have also been comprehensively studied.…”
mentioning
confidence: 99%