Abstract
U(IV) is irreversibly accumulated during synthesis of laser liquids POCl3-SnCl4-235UO22+-Nd3+ prepared from various initial Nd(III) and U(VI) compounds, irrespective of the way of their introduction. The rate of U(IV) accumulation in POCl3-SnCl4-235UO22+-Nd3+ solutions increases with increasing UO22+ and Nd3+ concentrations; for laser liquids with the Nd3+ luminescence lifetime τ > 150 μs the observed rate constant of U(IV) accumulation by the second-order reaction k2[U4+] is equal to (3 ± 1) × 10−5 1 mol−1 s−1 at T = 380 K. U(IV) is accumulated during storage of POCl3-SnCl4-235UO22+-Nd3+ solutions in hermetically sealed glass cells at room temperature and upon irradiation of solutions by xenon lamp light in the spectral region of UO22+ absorption. The U(VI) reduction proceeds by chemical and photochemical activation of uranyl with formation of stable U4+ complexes with dichlorophosphate ions and also with Nd3+. Deactivation of the uranyl ion excitation with proton-and chlorine-containing impurities prevents U(VI) reduction.
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