Scholarlink

<p>It is well established that a significant amount of heat produced in the Earth’s mantle is due to the decay of uranium. However, uranium cannot be incorporated in large amounts into the most common mantle minerals. Here, we suggest that carbonates could be host phases for uranium in carbon-rich mantle lithologies. Two anhydrous uranium carbonates,&#xa0;U<sub>2</sub>[CO<sub>3</sub>]<sub>3</sub>&#xa0;and U[CO<sub>3</sub>]<sub>2</sub>, were simultaneously synthesized by a reaction of UO<sub>2</sub> with CO<sub>2</sub> in a laser-heated diamond anvil cell at 20(1) GPa and 1800(200) K. Their crystal structures were obtained from synchrotron-based single crystal diffraction data and reproduced by density functional theory-based calculations. In U<sub>2</sub>[CO<sub>3</sub>]<sub>3</sub>&#xa0;trivalent uranium cations are present, while uranium is four-valent in U[CO<sub>3</sub>]<sub>2</sub>. The synthesis of U<sub>2</sub>[CO<sub>3</sub>]<sub>3</sub>&#xa0;and U[CO<sub>3</sub>]<sub>2</sub>&#xa0;is a significant extension of the chemistry of uranium compounds and we provide a straightforward synthesis route for a U<sup>III</sup>-containing compound.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

High-pressure synthesis of U2[CO3]3 and U[CO3]2 as potential host phases for uranium in the Earth’s mantle

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月30日

查看全文
  • Dominik Spahr,
  • Lkhamsuren Bayarjargal,
  • Elena Bykova,
  • Maxim Bykov,
  • Gabriel L. Murphy,
  • Philip Kegler,
  • Victor Milman,
  • Nico Giordano,
  • Björn Winkler

摘要

It is well established that a significant amount of heat produced in the Earth’s mantle is due to the decay of uranium. However, uranium cannot be incorporated in large amounts into the most common mantle minerals. Here, we suggest that carbonates could be host phases for uranium in carbon-rich mantle lithologies. Two anhydrous uranium carbonates, U2[CO3]3 and U[CO3]2, were simultaneously synthesized by a reaction of UO2 with CO2 in a laser-heated diamond anvil cell at 20(1) GPa and 1800(200) K. Their crystal structures were obtained from synchrotron-based single crystal diffraction data and reproduced by density functional theory-based calculations. In U2[CO3]3 trivalent uranium cations are present, while uranium is four-valent in U[CO3]2. The synthesis of U2[CO3]3 and U[CO3]2 is a significant extension of the chemistry of uranium compounds and we provide a straightforward synthesis route for a UIII-containing compound.