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

9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)

[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.