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.
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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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