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Citation: Nan Zhao-Dong, Tan Zhi-Cheng, Sun Li-Xian. Low Temperature Heat Capacities and Thermodynamic Functions of Potassium Dichromate[J]. Acta Physico-Chimica Sinica, ;2002, 18(10): 947-951. doi: 10.3866/PKU.WHXB20021017 shu

Low Temperature Heat Capacities and Thermodynamic Functions of Potassium Dichromate

1.
Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian　116023

Received Date: 18 January 2002
Available Online: 15 October 2002

The molar heat capacities (Cp,m) of crystalline potassium dichromate (K2Cr2O7) were measured with a precision automated adiabatic calorimeter over the temperature range from 100 K to 390 K. No phase transition or other thermal anomaly was observed in this temperature region. However, it was found that the relationship of Cp,m with respect to temperature T is different in different temperature regions. The polynomial functions of Cp,m vs. T were established in different temperature regions based on the heat capacity measurements by means of the least-fitting square method. These functions are as following: for 100 K ≤ T ≤ 275 K, Cp,m=0.0050T2－1.0320T＋125.22 (J•K－1•mol－1)；for 275 K ≤ T ≤ 350 K, Cp,m=209.37 J•K－1•mol－1；for 350 K ≤ T ≤390 K, Cp,m=0.0266T2－18.823T＋3542.3 J•K－1•mol－1.According to the relationship of Cp,m vs. T and thermodynamic equations, the values of thermodynamic function of potassium dichromate were calculated in the temperature range of 298.15～400.15 K with 5 K intervals.
- Potassium dichromate (K₂Cr₂O₇);Low-temperature heat capacity;Thermodynamic function;Adiabatic calorimetry
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