Rare-Earth Molecular Cluster Aggregates with Sandglass-like Core Topology as Surrogates for Minor Actinides in Immobilization within Alkaline-Earth Manganites
Rafał Petrus, Adrian Kowaliński, Tadeusz Lis, Miłosz Siczek, Piotr Sobota
TL;DR
This paper describes the synthesis of rare-earth molecular clusters that can act as substitutes for minor actinides in alkaline-earth manganites, aiding in their immobilization.
Contribution
The study introduces rare-earth molecular clusters with a sandglass-like core as novel surrogates for minor actinides in manganite immobilization.
Findings
MRE-doped CaMnO3 was the major phase formed at 1100°C with variable amounts of CaMn2O4.
BaMnO3:MRE(III) was produced under similar conditions with nanorod-like crystallites of MREMnO3 identified.
Alkaline-earth manganites effectively incorporate MRE(III) ions at Ca(II)/Ba(II) sites.
Abstract
In this study, a series of rare-earth molecular cluster aggregates with the formula [M9 RE(μ4-OH)2(μ3-OH)8(sal-R)16]X (MRE(III) = Y (1), Eu (2), Dy (3), Tm (4), Yb (5), Lu (6); X– = Cl– (1–2, 4–6), or DyCl4 – (3); Hsal-R = alkyl salicylate with R = Me (2, 4–6), Et (3), or Me and Et (1)) were synthesized via the direct reaction of rare-earth chlorides (MRECl3) with in situ generated lithium or zinc methyl salicylate salts in a ROH/tetrahydrofuran (THF) solution (ROH = MeOH, EtOH) under controlled moisture conditions. Complexes 1–6 were investigated as surrogates for minor actinides, with the aim of immobilizing these species in alkaline-earth manganites. The manganites were obtained by thermal decomposition of mixtures comprising either [Ca(sal-Et)2] n (7) or [Ba(sal-Et)2(THF)] n (8) with [Mn2(μ-OMe)2(sal-Me)4] (9) at 850 or 1100 °C. Thermolysis of compounds 7 and 9 in the presence…
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Taxonomy
TopicsAdvanced Condensed Matter Physics · Magnetic and transport properties of perovskites and related materials · Radioactive element chemistry and processing