Synthesis and characterisation of brannerite compositions (U0.9Ce0.1)1−xMxTi2O6 (M = Gd3+, Ca2+) for the immobilisation of MOX residues
نویسندگان
چکیده
D. J. Bailey, *a M. C. Stennett, a B. Ravel, D. Grolimund and N. C. Hyatt A suite of uranium brannerites for the disposal of MOX residues, formulated (U0.9Ce0.1)1 xMxTi2O6 (M 1⁄4 Ca and/or Gd), were prepared using a mixed oxide route under oxidising, inert and reducing atmospheres (air, argon andH2/N2). Gd was added to act as a neutron absorber in the final Pu bearingwasteformandCe added to function as a structural analogue for Pu. X-ray powder diffraction of the synthesised specimens found that phase distribution was strongly affected by the processing atmosphere and Gd content. In all cases prototypical brannerite was formed, accompanied by different secondary phases dependent on processing atmosphere. Microstructural analysis (SEM) of the sintered samples confirmed the results of the X-ray powder diffraction. Bulk XANES found that Ti remained in the Ti oxidation state whereas Ce was uniformly reduced to the Ce oxidation state regardless of processing conditions or stoichiometry. Microfocus XANES was used to determine U oxidation in the brannerite phase and showed that U oxidised to higher U oxidation states to charge compensate. It was concluded that the charge balance mechanism was a combination of U oxidation and A-site vacancies.
منابع مشابه
Synthesis and biological evaluation of a novel Glucosylated Derivative of Gadolinium Diethylenetriaminepentaacetic acid for Tumor Magnetic Resonance Imaging
Cancer detection in early stage using a powerful and noninvasive tool is of high global interest. In this experiment, a small-molecular-weight glucose based derivative of Gd3+-1-(4-isothiocyanatobenzyl) diethylene tri amine penta acetic acid (Gd3+-p-SCN-Bn‐DTPA‐DG) as a novel potential MR imaging contrast agents was synthesized. Gd3+-p-SCN-Bn‐DTPA‐DG was synthesized with reacting of Glucosamine...
متن کاملSynthesis and biological evaluation of a novel Glucosylated Derivative of Gadolinium Diethylenetriaminepentaacetic acid for Tumor Magnetic Resonance Imaging
Cancer detection in early stage using a powerful and noninvasive tool is of high global interest. In this experiment, a small-molecular-weight glucose based derivative of Gd3+-1-(4-isothiocyanatobenzyl) diethylene tri amine penta acetic acid (Gd3+-p-SCN-Bn‐DTPA‐DG) as a novel potential MR imaging contrast agents was synthesized. Gd3+-p-SCN-Bn‐DTPA‐DG was synthesized with reacting of Glucosamine...
متن کاملSynthesis, Characterisation and Flocculation Properties of Carboxymethyl Cellulose-g Acrylamide
Graft copolymers of acrylamide on carboxymethyl cellulose (d.s 0.4-0.5) were prepared by the use of ceric ion, ceric ion/reductant molecule initiator systems in aqueous medium. The graft copolymers were characterized by IR spectroscopy. The extent of graft copolymerisation was measured in terms of grafted chains as a function of both ceric ion and ceric ion/reductant molecule concentrations. It...
متن کاملSynthesis, characterisation and catalytic activity of Schiff base Cu(II) metal complex
This study reports the synthesis of chitosan anchored Schiff base, ([2-oxo-1H-indol-3-ylidene] amino) chitosan and its Cu (II) metal complex. The complex was characterized by elemental analysis, FT-IR Spectrum, thermogravimetry analysis .The crystallinity of the compound was analyzed by powder X-ray diffraction technique. The catalytic efficiency of complex was studied in the oxidation of alcoh...
متن کاملSynthesis, characterisation and catalytic activity of Schiff base Cu(II) metal complex
This study reports the synthesis of chitosan anchored Schiff base, ([2-oxo-1H-indol-3-ylidene] amino) chitosan and its Cu (II) metal complex. The complex was characterized by elemental analysis, FT-IR Spectrum, thermogravimetry analysis .The crystallinity of the compound was analyzed by powder X-ray diffraction technique. The catalytic efficiency of complex was studied in the oxidation of alcoh...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2018