Abstract
Non-metal nitrides such as BN, Si3N4, and P3N5 meet numerous demands on high-performance materials, and their high-pressure polymorphs exhibit outstanding mechanical properties. Herein, we present the silicon phosphorus nitride imide SiP2N4NH featuring sixfold coordinated Si. Using the multi-anvil technique, SiP2N4NH was obtained by high-pressure high-temperature synthesis at 8 GPa and 1100 degrees C with in situ formed HCl acting as a mineralizer. Its structure was elucidated by a combination of single-crystal X-ray diffraction and solid-state NMR measurements. Moreover, SiP2N4NH was characterized by energy-dispersive X-ray spectroscopy and (temperature-dependent) powder X-ray diffraction. The highly condensed Si/P/N framework features PN4 tetrahedra as well as the rare motif of SiN6 octahedra, and is discussed in the context of ambient-pressure motifs competing with close-packing of nitride anions, representing a missing link in the high-pressure chemistry of non-metal nitrides.
Item Type: | Journal article |
---|---|
Faculties: | Chemistry and Pharmacy > Department of Chemistry |
Subjects: | 500 Science > 540 Chemistry |
ISSN: | 1433-7851 |
Language: | English |
Item ID: | 83422 |
Date Deposited: | 15. Dec 2021, 15:07 |
Last Modified: | 15. Dec 2021, 15:07 |