Simultaneous generation of ultrahigh pressure and temperature to 50GPa and 3300K in multi-anvil apparatus.

Abstract

We attempted to generate ultrahigh pressure and temperature simultaneously using a multi-anvil apparatus by combining the technologies of ultrahigh-pressure generation using sintered diamond (SD) anvils, which can reach 120GPa, and ultrahigh-temperature generation using a boron-doped diamond (BDD) heater, which can reach 4000K. Along with this strategy, we successfully generated a temperature of 3300K and a pressure of above 50GPa simultaneously. Although the high hardness of BDD significantly prevents high-pressure generation at low temperatures, its high-temperature softening allows for effective pressure generation at temperatures above 1200K. High temperature also enhances high-pressure generation because of the thermal pressure. We expect to generate even higher pressure in the future by combiningSDanvils and a BDD heater with advanced multi-anvil technology.