Summary

The elasticity of minerals at high temperature and pressure is crucial for us in constraining the composition of Earth's interior and interpreting the seismic results. We obtained the elasticity of several minerals at the conditions of the Earth's mantle with first-principles calculations. These elastic data agree well with available experimental data. Based on these elasticity results, we discuss the multiple issues on the Earth’s interior such as the composition of the lower mantle, the relation between the dehydration of superhydrous phase B, the 800-km seismic discontinuity, and the water content in the transition zone.