Abstract
Equations of state (EoS) are widely used to interpolate and extrapolate the thermodynamic properties of solids and liquids across a broad range of pressure-temperature conditions, making them essential tools for modelling planetary interiors. In this talk, I will highlight how the assumptions and derivations underlying the most commonly used EoS formulations determine their applicability. I will further show that incorrect use can introduce biases and lead to an underestimation of uncertainties in models of planetary interiors.
All EoS models reproduce the data within the experimentally constrained range. However, their extrapolations diverge significantly at higher pressures, which may coincide with the stability field of the material in deep planetary interiors (shaded area). Such discrepancies are often overlooked when inferring planetary mantle and core compositions from comparisons between material EoS and the mass-density relations of (exo)planetary bodies.
Speaker
Dr. Giacomo Criniti
Scientist & Lecturer
Department of Earth and Environmental Sciences
LMU, Munich
Research Interests:
Earth's Deep Interiors | High-Pressure Experiments | Minerals Physics | Crystallography