Extrapolation of SGTE form 0 to 298.15K
The thermodynamics of SGTE from 0 to 298.15K are extrapolated by two methods. One is the extrapolation of polynomial model. The other is the extrapolation of Debye model. To take example for copper, the extrapolation methods are introduced in detail. By means of the constrained nonlinear least squares curve fitting arithmetic, two sets of parameter values have been determined. The expressions of the thermodynamic functions C_p (T) and G (T)-H (298.15K) at 0-298.15 K are presented. The polynomial model can accurately fit the experimental data, give the electronic heat capacity and the T=0 Debye temperature 00, be easy to use with a computer and, more importantly, has mathematically explicit expressions to link with the SGTE expressions, but has an excessive number of terms. The Debye model has a smaller number of terms and can give the electronic heat capacity and the average Debye temperature, but it is more complicated mathematically, its evaluation requires the help of computer and the low temperature data stored in the form of Gibbs energies, as do SGTE, has not explicit expressions.
extrapolation SGTE
Xiaobo Li Ping Zhang
College of Civil Engineering and Mechanics Key Laboratory of Materials Design and Preparation Techno College of Civil Engineering and Mechanics Xiangtan University Xiangtan, China
国际会议
太原
英文
381-385
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）