Phase and Chemical Transformations of the β-Radioactive Intermetallics in Fast-Neutron-Irradiated Uranium–Plutonium Nitrideстатья
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Аннотация:Thermodynamic analysis of the chemical and phase compositions of uranium–plutonium nitride (U0.8Pu0.2)N0.995 irradiated by fast neutrons shows that a complex structure forms in it. It consists of a solid solution containing uranium, plutonium, americium, neptunium, zirconium, yttrium, and lanthanide nitrides and individual condensed phases (U2N3, CeRu2, Ba3N2, CsI, Sr3N2, LaSe, (Mo + Tc), U(Ru, Rh, Pd)3. The contents and compositions of these phases are calculated at a temperature of 900 K and a burn-up fraction up to 14%. The β– decay of the metallic radionuclides is found to change the phase and chemical compositions of the irradiated (U0.8Pu0.2)N0.995 nitride. The kinetics of the transformations of the radioactive intermetallics U109Pd3 → U + 3109Ag, 141Ce103Ru2 → 141Pr103Rh2, and 144Ce106Ru2 → 144Nd106Pd2 is calculated.