| Abstract: | Lower mantle, ranging from 660 km to 2 890 km depth, occupies 49.2% of the Earth by mass and is at extremely high pressure and temperature conditions. Experimental studies on the physical properties of the lower mantle minerals, particular the structure, density, and sound velocity, etc., are important to understand the structure, composition, and dynamic behavior of the region. Here we summarize the recent experimental results on the structure and thermal equation of states of the lower mantle minerals, including bridgmanite, ferropericlase, CaSiO3-perovskite, and silicate post-perovskite, and discuss the effect of pressure, temperature, composition, and Fe-spin transition on the density and bulk sound velocity of those minerals. This review aims to provide new insights into the lower-mantle structure and chemistry and help to understand the observed velocity anomalies in the lower mantle. |
