【摘要】 以CdCl2和Na2CO3为原料,NaCl为稀释剂,利用固相反应合成前驱体,再经焙烧合成CdO纳米晶。用X-射线衍射(XRD)分析了不同焙烧温度对合成CdO晶粒尺寸的影响。研究结果表明:按Scherrer公式计算合成CdO纳米晶的晶粒尺寸在30～44nm,焙烧温度越高,晶粒尺寸越大;根据前驱体不同升温速率下的差热(DTA)曲线,用Kissinger和Ozawa法计算合成CdO纳米晶的活化能分别为164.7kJ mol和175.6kJ mol,差别不大;根据晶粒生长动力学理论计算CdO晶粒长大的活化能为12.2kJ mol,表明热处理过程CdO纳米晶粒的长大主要以界面扩散为主。更多还原

【Abstract】 Nanocryestalline cadmium oxide （CdO） was successfully synthesized by heating the precursor, which was obtained by solid-state reaction of CdCl₂ and Na₂CO₃ with NaCl as a diluent. Differential thermal analysis （DTA） was employed to investigate the crystallization kinetics of CdO nanoparticles. Variation of the CdO nanoparticle size with calcination temperature was investigated using X-ray diffractometry （XRD）. The mechanism for the nanocrystallite growth was primarily discussed. The results indicate that the synthesized CdO possesses a nanocrystalline structure with crystal size of 30～44nm, varying with the calcination temperature. The apparent activation energies of CdO nanocrystallite formation after calcination of the precursor were analyzed using Kissinger and Ozawa methods, the calculated values were 164.7kJ/mol and 175.6kJ/mol, respectively. The activation energy for the nanocrystallite growth was calculated to be 12.2 kJ/mol according to kinetics theory of nanocrystallite growth, indicating that CdO nanocrystallite grows primarily by means of an interfacial reaction during the calcination.更多还原