| Abstract Scope |
Densities of non-crystalline materials (NCMs) at high pressure (HP) are critical for Earth and planetary science because much of the Earth is in a liquid state. However, accurately measuring the density and local structure of NCM at HP remains a challenge[1-4]. There are still some long-standing puzzles in the well-studied GeO2 glass at high pressure [2]. In this conference, we present our recent approach for the determination of density and local structure of GeO2 glass at HP by ab initio molecular dynamics (AIMD) simulations[2,5], X-ray absorption and HP-XAFS[6]. The results obtained provide better insight into the origin of pressure-induced polyamorphism in GeO2 glasses.[1] Hong et al., RSI 78, 103905 (2007).[2] Hong et al., JPCM 35, 164001 (2023).[3] Hong et al., PRB 102, 134110 (2020).[4] Hong et al., PRB 101, 214107 (2020).[5] Hong et al., JPCS (accepted) (2025).[6] Hong et al., JPCM 26, 035104 (2014). |
