R3: High-pressure science and deep Earth’s material

[R3-04] A new approach to determine high pressure-temperature phase boundary strictly based on the definition of phase equilibrium

*Takayuki Ishii¹, Artem Chanyshev², Tomoo Katsura² (1. Center for High Pressure Science and Technology Advanced Research, 2. University of Bayreuth)

Keywords:Phase transition, phase equilibrium, Clapeyron slope, phase transition kinetics, post-spinel transition

The Clapeyron slope is essential for mantle dynamics. We present our recent development to determine a phase boundary strictly based on the phase equilibrium definition. An essential technique is to observe the change in X-ray diffraction intensity between low-pressure and high-pressure phases at a constant temperature and press load with the coexistence of both phases, removing problems happening during heating and providing an accurate and precise phase boundary.