本工作通过高压固相复分解反应(HPSSM)合成块体Re3N。利用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)和能量色散X射线分析(EDS)对高压样品进行结构表征与元素成分确定,结果表明利用HPSSM法合成的Re3N具有较高的晶体质量。在77 K到873 K温度范围内利用拉曼散射研究Re3N的晶格振动特性。基于三(四)声子耦合模型,研究Re3N拉曼声子模频率的红移和拉曼峰的宽化现象,结果表明高温条件下Re3N拉曼散射效应中三声子耦合过程占主导。高压同步辐射研究表明Re3N具有很高的体弹模量(B0=417 GPa),是一种潜在的超硬材料。

Well-crystallized bulk of Re3N was synthesized through a High-Pressure Solid-State Metathesis (HPSSM) reaction.The structural characterizations and compositions of as-prepared samples were determined by X-ray powder diffraction (XRD),scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDS),which indicated high crystalline quality of Re3N.The vibrational properties of Re3N lattices were studied by the temperature dependence on Raman spectroscopy between 77 K and 873 K.With the temperature increasing,the red-shift and broadening of Raman bands of Re3N could be well fitted using a model involving three-and four-phonon decay processes.Our fitting results indicated that the three-phonon decay processes were dominant over the four-phonon ones at high temperatures.The bulk modulus B0=417 GPa for Re3N was determined by high-pressure synchrotron radiation research indicating that Re3N synthesized through HPSSM reaction may be a potential superhard materials.