氯化铽气溶胶的高温热解机理

Thermal Decomposition Mechanism of Terbium Chloride Aerosol at High Temperature

以TbCl_3气溶胶为前驱体,在微纳米尺度研究了TbCl_3在空气氛围中的高温热解机理,用XRD和FESEM分别表征了热解产物的物相组成和微观形貌.基于实验结果和热力学分析,讨论了TbCl_3气溶胶热解生成Tb O2的化学反应机理,以及促进TbCl_3热解转变为氧化铽的动力学原因.研究结果表明:TbCl_3气溶胶在空气氛围中热解可生成具有化学计量比形式的氧化物Tb O2,当热解温度高于800℃时,热解产物为非化学计量比形式的Tb7O12,没有发现Tb OCl物相;在气溶胶热解产物中可以观察到更多热解中间产物,从而对TbCl_3的性质和热解过程的认识更充分.

Using TbCl 3 aerosol as the precursor,the thermal decomposition mechanism of TbCl 3 at high temperature was investigated from micro-and nano-scale in the condition of air atmosphere,and the phase composition and morphology of the pyrolysis products were characterized by XRD and FESEM,respectively.Based on the experimental results and thermodynamic analysis,it was discussed about the chemical reaction mechanism of the TbO 2 formation by thermal decomposition of TbCl 3 and kinetic reasons for promoting the conversion of TbCl 3 to terbium oxide.The results showed that the thermal decomposition of TbCl 3 could produce the stoichiometric form of TbO 2,the non-stoichiometric form of Tb 7O 12 was obtained when the thermal decomposition temperature was above 800℃,and TbOCl was not found in the pyrolysis products.From intermediate compounds observed in the pyrolysis products of the TbCl 3 aerosol,it is helpful to understand its property and thermal decomposition process.