引用本文:
李焕勇, 胡荣祖, 介万奇. ZnSe晶体气相生长输运剂Zn(NH4)3Cl5的热分解行为及动力学[J]. 应用化学,
2003, 20(4): 312-317.
Citation: LI Huan-Yong, HU Rong-Zu, JIE Wan-Qi. Thermal Decomposition Behavior of Zn(NH4)3Cl5 as a Chemical Transport Agent for ZnSe Single Crystal Growth[J]. Chinese Journal of Applied Chemistry, 2003, 20(4): 312-317.
Citation: LI Huan-Yong, HU Rong-Zu, JIE Wan-Qi. Thermal Decomposition Behavior of Zn(NH4)3Cl5 as a Chemical Transport Agent for ZnSe Single Crystal Growth[J]. Chinese Journal of Applied Chemistry, 2003, 20(4): 312-317.
ZnSe晶体气相生长输运剂Zn(NH4)3Cl5的热分解行为及动力学
摘要:
发展了一种新的ZnSe晶体气相生长输运剂Zn(NH4)3Cl5;用非等温TG-DTG技术,在5.0、10.0、15.0和20.0℃/min 4个不同线性升温条件下,研究了其热行为和热分解过程的非等温动力学。结果表明,分解过程分2步完成,讨论了与ZnSe晶体生长实验有关的第1步分解过程。第1步分解机理为随机成核与生长,机理函数为Avrami-Erofeev方程,f(α)={1/2(1-α)[-ln(1-α)]-1},G(α)=[-ln(1-α)]2。表观活化能E=162.94kJ/mol,指前因子A=1011.75s-1,动力学方程为dα/dt=1011.75{1/2(1-α)[-ln(1-α)]-1}exp(-(19598.3/T))。研究表明,Zn(NH4)3Cl5具有良好的热稳定性,是一种适合气相生长ZnSe晶体的输运剂;报道了应用此输运剂生长出ZnSe体单晶的最新结果。
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关键词:
- ZnSe
- / 晶体生长
- / 非等温动力学
- / Zn(NH4)3Cl5
- / 输运剂
English
Thermal Decomposition Behavior of Zn(NH4)3Cl5 as a Chemical Transport Agent for ZnSe Single Crystal Growth
Abstract:
The thermal behavior of Zn(NH4)3Cl5 have been investigated by non-isothermal TG-DTG at heating rates of 5.0,10.0,15.0 and 20.0℃/min.The results show that its thermal decomposition process can be divided into two steps.The first step,which is very important in ZnSe single crystal growth is controlled by random nucleation and growth mechanism.The most probable kinetic function in differential form,in integral form,the apparent activation energy (E) and the pre-exponential constant (A) of the process are founded to be{1/2(1-α)[-ln(1-α)]-1},[-ln(1-α)]2,162.94 kJ/mol,1011.75 s-1,respectively.The empirical kinetic model equation is dα/dt=1011.75{1/2(1-α)[-ln(1-α)]-1}exp(-(19598.3/T).The results indicate that Zn(NH4)3Cl5 has high thermal stability and is an excellent chemical transport agent for ZnSe single crystal growth from vapor.Two ZnSe bulk crystals were obtained from vapor using Zn(NH4)3Cl5 as a transport agent.
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Key words:
- ZnSe
- / crystal growth
- / non-isothermal kinetics
- / Zn(NH4)3Cl5
- / chemical transport agent
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