利用平面波密度泛函理论研究了盐石结构MgO的状态方程。所得到的结果与实验值和其他作者的计算值符合很好.同时,还研究了热膨胀系数随温度和压强的变化关系.结果显示:在高压下。温度对盐石结构MgO热膨胀系数的影响很小.
The equations of state (EOS) of the rocksalt (RS) structure MgO are investigated by ab initio plane-wave pseudopotential density functional theory method. The obtained results are consistent with the experimental data and those calculated by others. The variation of the thermal expansion α with temperature and pressure is also investigated, which shows the temperature has hardly effect on the thermal expansion α of RS structure MgO at higher pressure.