Under high pressure,unsaturated bond systems generally undergo irreversible transfonnations to produce carbon-based polymeric materials with peculiar properties.
Light elements(e.g.,Li,B,C)with extraordinary bonding features often present novel physical properties,such as superconductivity,metal-insulator transitions,and superhardness.
Deep crustal earthquakes have been recorded under Southern Tibet down to depths of~100 km,within the subducted Indian continental plate,where the lower crust is considered hot and dry [1].
Crystallographic preferred orientation(CPO)of post-perovskite(Mg,Fe)SiO3(pPv)has been believed to be one potential source of the seismic anisotropic layer at the bottom of the lower mantle(D" layer).