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$Synthesis and Microdiffraction at Extreme Pressures and Temperatures$

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

Liquid structure under extreme conditions: high-pressure x-ray diffraction studies.

James W E Drewitt¹

¹School of Physics, University of Bristol, H H Wills Physics Laboratory, Tyndall Avenue, Bristol, BS8 1TL, United Kingdom.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|September 20, 2021

Summary

High pressure and temperature transform liquid structures, impacting materials and planetary science. Advanced synchrotron X-ray diffraction now enables routine study of these extreme liquid states.

Keywords:

diffraction high-pressure liquid structure

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Area of Science:

Condensed matter physics
Materials science
Planetary science

Background:

Liquids undergo significant structural changes under extreme high pressure and temperature conditions.
Understanding these transformations is crucial for fundamental physics, chemistry, materials science, and planetary science.
Studying liquid structure at high pressures is challenging due to experimental difficulties and the disordered nature of liquids.

Purpose of the Study:

To review methods for high-pressure synchrotron X-ray diffraction of liquids.
To examine diverse liquid systems studied using these techniques.
To highlight recent advances in high-pressure liquid structure determination.

Main Methods:

High-pressure synchrotron X-ray diffraction (HP-XRD).
Atomistic simulations.
In situ experimental techniques.

Main Results:

Demonstration of routine feasibility of liquid diffraction measurements at synchrotron facilities.
Characterization of structural transformations in various liquid systems, including liquid metals, pnicogen and chalcogen liquids, water, and silicate melts.
Insights into liquid-liquid phase transitions and melting relations of high-pressure materials.

Conclusions:

Advances in high-pressure technology have made in situ liquid diffraction studies more accessible.
Synchrotron X-ray diffraction is a powerful tool for probing the atomic-scale structure of liquids under extreme conditions.
This research provides critical data for understanding geological processes and developing new materials.