显微拉曼光谱评价HMX晶体结晶品质

采用显微拉曼光谱分析技术研究了单晶HMX、球形化HMX和工业品HMX的结晶品质与拉曼光谱特征参数之间的关系。通过对HMX晶体显微拉曼光谱谱峰的对比研究,确定了其拉曼光谱特征峰为951 cm-1。对不同品质HMX的特征峰的半峰宽和相对标准偏差进行统计分析,得单晶HMX、球形化HMX和工业品HMX951 cm-1处的半峰宽均值分别为15.18,16.71,17.84 cm-1,相对标准偏差分别为0.0143%、0.0524%和0.129%,而HMX单晶单点12次测试结果为15.18 cm-1和0.0122%。分析三种不同品质HMX晶体的扫描电镜图和折光匹配显微图片,认为单晶HMX品质最好,球形化HMX次之,工业品HMX最差。结果表明,可利用拉曼光谱特征峰的半峰宽和相对标准偏差来评价HMX晶体的结晶品质,特征峰的半峰宽越接近15.19 cm-1,相对标准偏差越小,样品的结晶品质越高。

Quality Evaluation of HMX Crystals by Micro-raman Spectroscopy

The relationship between characteristic parameters of micro-raman spectra and quality of different HMX crystals including single crystal, spherical crystal and industrial crystal was studied. Based on the comparison of peaks of micro-raman spectra, the 951 cm^-1 was determined to be the characteristic peak of HMX crystal. Statistical analysis was used for full width at half maximum (FWHM) of characteristic peak and the relative standard deviation (RSD) of measurements with the results that the FWHMs for single crystal, spherical crystal and industrial crystal were 15.18, 16.71, 17.84 cm^-1, and the RSDs for the three HMX crystals were 0.0143%, 0.0524% and 0.129%, respectively. While, by parallel test at one point for 12 times, the FWHM and RSD for HMX single crystal was 15.18 cm^-1 and 0.0122%. Through matching refractive micrograph and scanning electron microscopy images, the quality order for the three HMX crystals was single crystal > spherical crystal > industrial crystal. So, it can be conclude that the characteristic peak parameters of HMX crystal by micro-raman spectra can be used to evaluate the quality of HMX crystals: the closer the FWHM is to 15.18 cm^-1, the smaller the RSD, and the better the quality of HMX crystals.