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为了在量热实验中应用Burton Cabrera Frank(BCF)位错理论,设计了Zn(Val)Ac2在水 丙酮混合溶剂 中的稀释/结晶体系.为此,通过实验,首先确定了Zn(Val)Ac2在水 丙酮中稀释/结晶生长的最佳体积比为 1∶10.设计了测定该稀释/结晶生长过程的实验方法和框图,简要推导了该结晶生长过程的动力学方程,认为当 晶体生长过程中的BCF常数a和b远小于结晶生长速率常数k2和k1时,结晶过程即符合BCF理论.用微量热 法测定了反应体系分别在298.15、301.15、304.15和307.15K时的放热量及产热速率,计算得到了各温度下的 结晶生长速率常数k2×10-3和k1×10-3分别为3.60、3.92、4.22、4.47J/s和1.54、2.14、2.53、2.97L/s而相 应的BCF常数a×10-5和b×10-7的值分别为3.09、1.16、2.06、2.99J/s和1.10、0.53、1.03、1.66g/s,远比 k2和k1小,从而证明了该结晶过程符合BCF位错理论,说明在一定条件下,BCF位错理论可应用于微量热实 验中.
In order to apply the theory of Burton Cabrera Frank (BCF) dislocation in calorimetry experiment, we designed a dilute / crystalline system of Zn (Val) Ac2 in water-acetone mixed solvent.To this end, Zn (Val) Ac2 The best volume ratio of dilution / crystallization in water acetone is 1:10. The experimental method and block diagram for the determination of the growth of the diluted / crystal were designed and the kinetic equation of the crystal growth was briefly deduced. In the BCF constants a and b are far less than the crystal growth rate constants k2 and k1, the crystallization process is in line with the BCF theory.The calorific value and heat production of the reaction system at 298.15, 301.15, 304.15 and 307.15 K The calculated crystal growth rate constants k2 × 10-3 and k1 × 10-3 for each temperature were 3.60, 3.92, 4.22, 4.47 J / s and 1.54, 2.14, 2.53 and 2.97 L / s, respectively, BCF constants a × 10-5 and b × 10-7 are 3.09, 1.16, 2.06, 2.99 J / s and 1.10, 0.53, 1.03 and 1.66 g / s, respectively, which are much smaller than k2 and k1, The crystallization process conforms to the BCF dislocation theory, indicating that under certain conditions, the BCF dislocation theory can In the microcalorimetry experiments.