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首页> 外文期刊>Crystal Research and Technology: Journal of Experimental and Industrial Crystallography >Study on crystallization kinetics and the crystal internal defects of HMX
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Study on crystallization kinetics and the crystal internal defects of HMX

机译：HMX的结晶动力学和晶体内部缺陷的研究

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In this paper, the solubility data of HMX (1,3,5,7-tetranitro-1,3,5,7-tetrazocane) in acetone from 323.15 K to293.15 K were accurately measured by use of the laser-monitoring observation technique. Intermittent dynamic method was utilized to study crystallization kinetics of HMX in acetone. The data of crystallization kinetics were obtained by moment analysis, and the parameters of the growth rate and nucleation rate equations were derived by using multiple linear least squares method. Subsequently, growth rate and nucleation rate at different conditions were calculated according to these equations. In addition, Optical Microscopy Images (qualitative) and Particle Apparent Density (quantitative) experiments were applied to study the crystal internal defects of HMX under different crystallization conditions. It can be found that the crystal apparent density of HMX is in the range of 1.8993 g·cm~(-3) to 1.9017 g·cm~(-3), very close to the theory density of HMX; the internal defects and the crystal size do not increase after 25 ?C, from which we predict that the HMX crystal growth reaches the steady growth segment. These results suggest that the nucleation rate is a significant factor influencing the crystal internal defects, and larger nucleation kinetics can reduce crystal internal defects.
机译：本文通过激光监测观察，精确测量了HMX（1,3,5,7-四硝基-1,3,5,7-四唑烷）在丙酮中从323.15 K至293.15 K的溶解度数据。技术。采用间歇动力学方法研究了HMX在丙酮中的结晶动力学。通过矩量分析获得结晶动力学数据，并采用多元线性最小二乘法推导生长速率和成核速率方程的参数。随后，根据这些方程式计算出在不同条件下的生长速率和成核速率。另外，通过光学显微镜图像（定性）和颗粒表观密度（定量）实验研究了HMX在不同结晶条件下的晶体内部缺陷。可以发现，HMX的晶体表观密度在1.8993g·cm〜（-3）至1.9017g·cm〜（-3）的范围内，非常接近HMX的理论密度。内部缺陷和晶体尺寸在25°C之后不会增加，由此我们可以预测HMX晶体的生长达到了稳定的生长段。这些结果表明成核速率是影响晶体内部缺陷的重要因素，更大的成核动力学可以减少晶体内部缺陷。

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