April 20, 2020 Dataset Closed Access

Estevenon, Paul; Welcomme, Eléonore; Tamain, Christelle; Jouan, Gauthier; Szenknect, Stéphanie; Mesbah, Adel; Poinssot, Christophe; Moisy, Philippe; Dacheux, Nicolas

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    <subfield code="a">&lt;p&gt;Attempts to synthesize plutonium (IV) silicate, PuSiO&lt;sub&gt;4&lt;/sub&gt;, have been performed on the basis of the results recently reported in the literature for CeSiO&lt;sub&gt;4&lt;/sub&gt;, ThSiO&lt;sub&gt;4&lt;/sub&gt; and USiO&lt;sub&gt;4&lt;/sub&gt; under hydrothermal conditions. Although it was not possible to prepare PuSiO&lt;sub&gt;4&lt;/sub&gt; by applying the conditions reported for thorium and uranium, an efficient way of PuSiO&lt;sub&gt;4&lt;/sub&gt; synthesis was established following those optimized for CeSiO&lt;sub&gt;4&lt;/sub&gt; system. This method was based on the slow oxidation of plutonium (III) silicate reactants under hydrothermal conditions at 150&amp;deg;C in hydrochloric acid (pH&amp;nbsp;=&amp;nbsp;3&amp;nbsp;&amp;ndash;&amp;nbsp;4). This result shed a new light on the potential behavior of plutonium in reductive environment, highlighted the representativeness of cerium surrogates to study plutonium in such conditions and brought some important pieces of information on plutonium chemistry in silicate solutions.&lt;/p&gt;</subfield>
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