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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. shu

Thermal Decomposition Behavior of Zn(NH₄)₃Cl₅ as a Chemical Transport Agent for ZnSe Single Crystal Growth

1.
a State Key Laboratory of Solidification Processing, Northwest Polytechnical University, Xi'an 710072;
2.
b Department of Chemistry, Northwest University, Xi'an 710069

Corresponding author: LI Huan-Yong,
Received Date: 18 September 2002
Available Online: 25 December 2002
Fund Project: 国家杰出青年基金(59825109) (59825109)陕西省自然科学基金(2001H08)资助课题 (2001H08)

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=10^11.75{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.
- ZnSe,
- crystal growth,
- non-isothermal kinetics,
- Zn(NH₄)₃Cl₅,
- chemical transport agent
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Thermal Decomposition Behavior of Zn(NH₄)₃Cl₅ as a Chemical Transport Agent for ZnSe Single Crystal Growth