研究目的
Investigating the synthesis of solid lithium pentazolate (LiN5) compound by compressing lithium azide and molecular nitrogen under high pressure with laser heating, and its potential applications as high energy density materials.
研究成果
The study successfully synthesized the predicted P21/m-LiN5 for the first time by laser heating compressed LiN3 and N2 up to 41.1 GPa. The LiN5 remains stable down to 18.5 GPa and has bond lengths between those of single and double bonds, indicating its potential as a high energy density material. This research provides a new route for the synthesis of polynitrogen compounds.
研究不足
The study is limited by the high-pressure conditions required for the synthesis of LiN5 and the stability of LiN5 down to only 18.5 GPa upon decompression.
1：Experimental Design and Method Selection:
The study involved compressing lithium azides and molecular nitrogen in a diamond anvil cell (DAC) up to
2：1 GPa with laser heating. The formation of LiN5 was characterized using in-situ Raman spectroscopy and XRD. Sample Selection and Data Sources:
Solid lithium azide (LiN3) sample was obtained from a lithium azide solution through a freeze-drying process. Nitrogen was used as the pressure transmitting medium.
3：List of Experimental Equipment and Materials:
Diamond anvil cell (DAC) with a diameter of the diamond culet of 300 μm, drilled rhenium gaskets as sample chambers, laser beam (λ=1064 nm) for heating, LabRAM HR Evolution spectrometer for Raman spectra, and synchrotron XRD at BL15U1 beamline station of Shanghai Synchrotron Radiation Facility (SSRF).
4：Experimental Procedures and Operational Workflow:
The sample was loaded into DAC, pressures were measured using ruby fluorescence, and laser heating was applied. Raman spectra and XRD patterns were collected before and after laser heating.
5：Data Analysis Methods:
The structural refinements were performed through Le Bail methods using the GSAS software package.
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