当前位置：
X-MOL 学术
›
Inorg. Chem.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Hydrothermal Conversion of Thorium Oxalate into ThO2·nH2O Oxide
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-09-30 , DOI: 10.1021/acs.inorgchem.0c01633 Jérémie Manaud 1 , Jérôme Maynadié 1 , Adel Mesbah 1 , Myrtille O. J. Y. Hunault 2 , Philippe M. Martin 3 , Morgan Zunino 1 , Nicolas Dacheux 1 , Nicolas Clavier 1
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-09-30 , DOI: 10.1021/acs.inorgchem.0c01633 Jérémie Manaud 1 , Jérôme Maynadié 1 , Adel Mesbah 1 , Myrtille O. J. Y. Hunault 2 , Philippe M. Martin 3 , Morgan Zunino 1 , Nicolas Dacheux 1 , Nicolas Clavier 1
Affiliation
|
Hydrothermal conversion of thorium oxalate, Th(C2O4)2·nH2O, into thorium dioxide was explored through a multiparametric study, leading to some guidelines for the preparation of crystallized samples with the minimum amount of impurities. As the formation of the oxide appeared to be operated through the hydrolysis of Th4+ after decomposition of oxalate fractions, pH values typically above 1 must be considered to recover a solid phase. Also, because of the high stability of the thorium oxalate precursor, hydrothermal treatments of more than 5 h at a temperature above 220 °C were required. All the ThO2·nH2O samples prepared presented amounts of residual carbon and water in the range 0.2–0.3 wt % and n ≈ 0.5, respectively. A combined FTIR, PXRD, and EXAFS study showed that these impurities mainly consisted of carbonates trapped between elementary nanosized crystallites, rather than substituted directly in the lattice, which generated a tensile effect over the crystal lattice. The presence of carbonates at the surface of the elementary crystallites could also explain their tendency to self-assembly, leading to the formation of spherical aggregates. Hydrothermal conversion of oxalates could then find its place in different processes of the nuclear fuel cycle, where it will provide an interesting opportunity to set up dustless routes leading from ions in solution to dioxide powders in a limited number of steps.
中文翻译：
草酸Thor的水热转化为ThO 2 · n H 2 O氧化物
通过多参数研究探索了草酸or（Th（C 2 O 4）2 · n H 2 O ）的水热转化为二氧化th ，从而为杂质最少的结晶样品的制备提供了一些指南。由于草酸盐馏分分解后，氧化物的形成似乎是通过Th 4+的水解而进行的，因此必须考虑通常高于1的pH值才能回收固相。同样，由于草酸or前体的高稳定性，需要在高于220°C的温度下进行5 h以上的水热处理。全部ThO 2 · n H 2ø样品制备呈现残留碳和水的量范围为0.2-0.3％（重量）和Ñ分别≈0.5。FTIR，PXRD和EXAFS的组合研究表明，这些杂质主要由捕获在基本纳米尺寸微晶之间的碳酸盐组成，而不是直接取代在晶格中，从而在晶格上产生拉伸效应。基本微晶表面上碳酸盐的存在也可以解释其自组装的趋势，从而导致球形聚集体的形成。草酸盐的水热转化然后可以在核燃料循环的不同过程中找到其位置，这将提供一个有趣的机会，以有限的步骤建立从溶液中的离子到二氧化碳粉末的无尘路线。
更新日期：2020-10-21
中文翻译：
草酸Thor的水热转化为ThO 2 · n H 2 O氧化物
通过多参数研究探索了草酸or（Th（C 2 O 4）2 · n H 2 O ）的水热转化为二氧化th ，从而为杂质最少的结晶样品的制备提供了一些指南。由于草酸盐馏分分解后，氧化物的形成似乎是通过Th 4+的水解而进行的，因此必须考虑通常高于1的pH值才能回收固相。同样，由于草酸or前体的高稳定性，需要在高于220°C的温度下进行5 h以上的水热处理。全部ThO 2 · n H 2ø样品制备呈现残留碳和水的量范围为0.2-0.3％（重量）和Ñ分别≈0.5。FTIR，PXRD和EXAFS的组合研究表明，这些杂质主要由捕获在基本纳米尺寸微晶之间的碳酸盐组成，而不是直接取代在晶格中，从而在晶格上产生拉伸效应。基本微晶表面上碳酸盐的存在也可以解释其自组装的趋势，从而导致球形聚集体的形成。草酸盐的水热转化然后可以在核燃料循环的不同过程中找到其位置，这将提供一个有趣的机会，以有限的步骤建立从溶液中的离子到二氧化碳粉末的无尘路线。
京公网安备 11010802027423号