纳米三氧化二钴低温热容和热力学性质的研究  

Low-Temperature Heat Capacity and Thermodynamic Functions of Nano Co_2O_3

作　　者：南照东[1] 谭志诚[1] 蓝孝征[1] 孙立贤[1] 关荐伊[2] 

机构地区：[1]中国科学院大连化学物理研究所热化学实验室,大连116023 [2]承德石油高等专科学校化工系,承德067000

出　　处：《无机化学学报》2003年第3期325-328,共4页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(No.20073047);王宽诚博士后工作奖励基金(No.);中国博士后基金资助项目(No.)。

摘　　要：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.The isobaric molar heat capacities of nano Co2O3 were determined by an adiabatic calorimeter in the temperature range from 78 to 350K. No phase transition takes place in this temperature range. The relationship of C, with respect to thermodynamic temperature T was established as C-p,C-m = -11.998 X-3 - 9.6431 X-2 + 63. 478 X + 81. 291(J . K-1 . mol(-1)), where X = ( T - 201. 903) /121. 535, the correlation coefficient R-2 = 0. 9996. According to this relationship and the relationships between thermodynamic functions, the thermodynamic functions of nano Co2O3 relative to the standard temperature of 298. 15K were derived based on the measured heat capacity data. The average grain size of the studied nano Co2O3 sample was determined to be 12nm by TEM.

关 键 词：纳米Co2O3 热容 热力学函数 

分 类 号：O614.812[理学—无机化学]