密度泛函理论在氮化反应热力学参数中的计算研究
he calculate research of nitrogen’s thermodynamics in Density function theory
本文提出了采用密度泛函理论对热力学参数进行系统计算的方法。通过建立各氮化物原子模型,首先采用经验公式和密度泛函理论计算了各反应产物的焓,两者结果基本一致,证明了该方法的可信性。然后在abi nitio半经验AM1方法下对模型进行了结构优化,并采用密度泛函理论(DFT:Density Functional Theory Methods)的B3LYP方法,结合设定的热化学方程,在6-31G基组水平上,系统计算了在298K、500K、800K、1000K、1200K、1400K、1600K和1800K下金属Al、Zr、Cr、V、Ti等与氮气发生反应的熵变 ,结果表明:随温度的升高,各种金属反应的熵增越来越少,即反应越来越容易;在相同温度下的与氮气反应的不可逆程度依次为Cr〉Ti〉Zr〉V〉Al,与目前已知计算数据和实验结果一致。
ccording to building the models of the nitrogen ,we use the Austin Model 1(AM1) which belongs to semi-empirical methods to optimize the Geometry of the modeling. Under this frame, there are many research and report on the influence that nitrogen to the steel function and the methods of nitrogen permeate through steel and the control on the process. The active law between iron and nitrogen and the action between nitrogen and other element in steel are researched deeply. According to some relevant theories of metal thermo physics and the Ab initio calculation the paper systematically calculates the thermodynamics parameter that part of metals produce functioned with nitrogen under changeable temperature, e.g. reaction heat. under the guidance of theoretical calculation, the law of the reaction of metals and nitrogen is analyzesed ,and the data is according with the experience formulate and the experiment data.
徐慧、李燕峰、宋招权
化学冶金工业概论有色金属冶炼
热力学函数密度泛函熵变焓氮化物
thermodynamics functionDensity Function Theoryenvironmental changeenthalpyNitride
徐慧,李燕峰,宋招权.密度泛函理论在氮化反应热力学参数中的计算研究[EB/OL].(2005-05-02)[2025-08-06].http://www.paper.edu.cn/releasepaper/content/200505-1.点此复制
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