晶体热膨胀的研究

Study of Thermal Expansion of the Crystal

微观研究发现,晶体热膨胀应是原子非简谐振动的宏观表现。进一步分析原子间相互作用力,将原子间相互作用势按泰勒级数展开后与线膨胀系数定义式结合,得到一线膨胀系数的具体计算公式。原子相互作用势取Morse势,计算NaCl晶体的线膨胀系数,结果在室温和高温条件下与实验值均符合较好。

From a micro perspective,the thermal expansion of crystals is the performance of atomic non-simple harmonic motion.Through further analyzing the interaction between atoms,we combine the atomic interaction potential which is expanded by the Taylor＇s series with the coefficient of linear expansion,and then get a formula of linear expansion coefficient.The potential is chosen to be the form of Morse potential.Through calculating the linear expansion coefficient of NaCl crystal,we find the values of calculation are good agreement with the experimental data at room temperature and high temperature.