The heat capacities of KHSO4 crystal (A. R. ) have been measured with a small sample precision automated adiabatic calorimeter over the temperature range from 78 to 373 K. The experimental results have shown that ther...The heat capacities of KHSO4 crystal (A. R. ) have been measured with a small sample precision automated adiabatic calorimeter over the temperature range from 78 to 373 K. The experimental results have shown that there is no phase transition or thermal anomaly in this temperature region for the present crystal. The experimental heat-capacity data have been fitted to a smoothed curve with the aid of the least square method. In addition, the process of the thermal decomposition has been studied by TG analysis.展开更多
The isobaric molar heat capacities o f nano Co 2 O 3 were determined by an adiabatic calo rimeter in the temper-ature range from 78to 350K.No phase t ransition takes place in this temperature range.The relationship of...The isobaric molar heat capacities o f nano Co 2 O 3 were determined by an adiabatic calo rimeter in the temper-ature range from 78to 350K.No phase t ransition takes place in this temperature range.The relationship of C p,m with respect to thermodynamic temperature T was established as C p,m =-11.998X 3 -9.6431X 2 +63.478X+81.291(J·K -1 ·mol -1 ),where X=(T-201.903)/121.535,the correlation coefficient R 2 =0.9996.Ac-cording to this relationship and the relationships between thermodynam ic functions,the thermodynamic functions of nano Co 2 O 3 relative to the standard temperatur e of 298.15K were derived based on the measured heat capacity data.The average grain size of the studied nano Co 2 O 3 sample was determined to be 12nm by TE M.展开更多
文摘The heat capacities of KHSO4 crystal (A. R. ) have been measured with a small sample precision automated adiabatic calorimeter over the temperature range from 78 to 373 K. The experimental results have shown that there is no phase transition or thermal anomaly in this temperature region for the present crystal. The experimental heat-capacity data have been fitted to a smoothed curve with the aid of the least square method. In addition, the process of the thermal decomposition has been studied by TG analysis.
文摘The isobaric molar heat capacities o f nano Co 2 O 3 were determined by an adiabatic calo rimeter in the temper-ature range from 78to 350K.No phase t ransition takes place in this temperature range.The relationship of C p,m with respect to thermodynamic temperature T was established as C p,m =-11.998X 3 -9.6431X 2 +63.478X+81.291(J·K -1 ·mol -1 ),where X=(T-201.903)/121.535,the correlation coefficient R 2 =0.9996.Ac-cording to this relationship and the relationships between thermodynam ic functions,the thermodynamic functions of nano Co 2 O 3 relative to the standard temperatur e of 298.15K were derived based on the measured heat capacity data.The average grain size of the studied nano Co 2 O 3 sample was determined to be 12nm by TE M.
