Activities per year
Abstract
The atomic-scale structure, melting curve, and equation of state of liquid gallium has been measured to high-pressure (p) and -temperature (T) up to 26GPa and 900K by in situ synchrotron x-ray diffraction. Ab initio molecular dynamics simulations up to 33.4GPa and 1000K are in excellent agreement with the experimental measurements, providing detailed insight at the level of pair
distribution functions. The results reveal an absence of dimeric bonding in the liquid-state and a continuous increase in average coordination number nGaGa from 10.4(2) at 0.1 GPa approaching ~12 by 25 GPa. Topological cluster analysis of the simulation trajectories finds increasing fractions of five-fold symmetric and crystalline motifs at high-p-T. Although the liquid progressively resembles a
hard-sphere structure towards the melting curve, the deviation from this simple description remains large (> 40 %) across all p-T-space, with specific motifs of different geometries strongly correlating with low local two-body excess entropy at high-p-T.
Original language | English |
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Article number | 145501 |
Number of pages | 6 |
Journal | Physical Review Letters |
Volume | 124 |
DOIs | |
Publication status | Published - 9 Apr 2020 |
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Activities
- 1 Invited talk
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Bristol HPC Symposium 2020
James W E Drewitt (Invited speaker)
17 Sep 2020Activity: Participating in or organising an event types › Invited talk
Equipment
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HPC (High Performance Computing) facility
Caroline E Gardiner (Manager)
IT ServicesFacility/equipment: Facility
Profiles
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Dr Oliver T Lord
- School of Earth Sciences - Royal Society University Research Fellow and Proleptic Lecturer
- Geophysics
- Petrology (formerly BEEST)
Person: Academic , Member