High-pressure synthesis of dysprosium carbides.
High-pressure synthesis of dysprosium carbides.
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DOI：
10.3389/fchem.2023.1210081
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发表时间：
2023
影响因子：
5.5
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中科院分区：
文献类型：
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在激光加热的金刚石砧细胞中，分别在19、55和58 GPa的压力和~ 2500 K的温度下研究了镝和碳之间的化学反应。对反应产物的原位单晶同步x射线衍射分析显示，形成了新型的碳化镝Dy4C3和Dy3C2，以及以前只在环境条件下已知的倍半碳化镝Dy2C3。Dy4C3的结构与倍卡脲镝Dy2C3的结构密切相关，均为pu2c3型结构。从头计算重现了所有合成相的晶体结构，并预测了它们的压缩行为，与我们的实验数据一致。我们的工作证明高压合成条件丰富了稀土金属碳化物的化学性质。
Chemical reactions between dysprosium and carbon were studied in laser-heated diamond anvil cells at pressures of 19, 55, and 58 GPa and temperatures of ∼2500 K. In situ single-crystal synchrotron X-ray diffraction analysis of the reaction products revealed the formation of novel dysprosium carbides, Dy4C3 and Dy3C2, and dysprosium sesquicarbide Dy2C3 previously known only at ambient conditions. The structure of Dy4C3 was found to be closely related to that of dysprosium sesquicarbide Dy2C3 with the Pu2C3-type structure. Ab initio calculations reproduce well crystal structures of all synthesized phases and predict their compressional behavior in agreement with our experimental data. Our work gives evidence that high-pressure synthesis conditions enrich the chemistry of rare earth metal carbides.