Salamat Ashkan, Woodhead Katherine, Shah S Imran U, Hector Andrew L, McMillan Paul F
Lyman Laboratory of Physics, Harvard University, Cambridge, MA 02138, USA.
Chem Commun (Camb). 2014 Sep 11;50(70):10041-4. doi: 10.1039/c4cc05147e.
Combining metastable precursors with high pressure-temperature treatment is a powerful tool to make nitrogen-rich metal nitrides. Two new dense polymorphs of Ta3N5 have previously been theoretically predicted, with U3Se5 (Pnma) and U3Te5 (Pnma) structure types, and are now shown to exist. Amorphous Ta3N5 from thermal ammonolysis of an amorphous polymeric precursor was laser heated at 22 GPa and examined using synchrotron X-ray diffraction to reveal the emergence of these two novel polymorphs.
将亚稳态前驱体与高压-高温处理相结合是制备富氮金属氮化物的有力工具。此前理论预测Ta3N5有两种新的致密多晶型，具有U3Se5（Pnma）和U3Te5（Pnma）结构类型，现在已证明它们确实存在。通过对无定形聚合物前驱体进行热氨解得到的非晶态Ta3N5在22 GPa下进行激光加热，并使用同步加速器X射线衍射进行检测，以揭示这两种新型多晶型的出现。
