Abstract
The preparation routes for ceramic-metal matrices (CMM) Tc-NpO2 and their imitators Tc(Re)-ThO2 and Tc(Re)-Nd2O3 with different metal-oxide ratios has been investigated and the physical and chemical properties (such as leaching, thermal stability) of the products were determined. The structure of [Np(H2O)3(TcO4)4]×H2O has been determined by single crystal X-ray diffraction analysis. Thermal decomposition of neptunium pertechnetates (IV and VI) as well as their imitators neodymium and thorium perrhenates were considered in detail. The surface morphology for CMM Tc-NpO2 and the leaching rate of each radionuclide was experimentally determined.
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