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Citation: YUE Dan-Ting, TAN Zhi-Cheng, DONG Li-Na, SUN Li-Xian, ZHANG Tao. Low-temperature Heat Capacity and Thermodynamic Functions of Nano ZnO[J]. Acta Physico-Chimica Sinica, ;2005, 21(04): 446-449. doi: 10.3866/PKU.WHXB20050421 shu

Low-temperature Heat Capacity and Thermodynamic Functions of Nano ZnO

1.
Thermochemistry Laboratory. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023; Marine Engineering College, Dialian Maritime University, Dalian 116026

Received Date: 29 September 2004
Available Online: 15 April 2005

The size of nano ZnO powders was determined to be 30 nm in diameter by SEM. The isobaric molar heat capacity C_p of the nano ZnO was measured with high precision adiabatic low-temperature calorimeter in temperature range from 83 K to 350 K. The relationship of C_p with temperature T was established as: C_p＝－3.249＋0.2400T－3.413×10^－4T ²＋4.485×10^－7T ³. The thermodynamic functions of the nano ZnO, relative to the standard temperature of 298.15 K, were derived based on the heat capacity data through thermodynamic relationship. The measured C_p values were compared with those of coarse crystal and 18 nm ZnO powders cited from literature and the difference between the C_p curves was analyzed.
- Nano ZnO; Low-temperature heat capacity; Thermodynamic functions
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