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Phase Diagrams

Phase Diagrams

A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...

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Updated: Mar 13, 2026

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

Published on: June 13, 2015

High-pressure structural changes in liquid silica.

A Denoeud^1,2, S Mazevet^3,4, F Guyot⁵

¹LULI-CNRS, Ecole Polytechnique, CEA, Université Paris-Saclay, F-91128 Palaiseau cedex, France.

Physical Review. E

|October 15, 2016

Summary

This summary is machine-generated.

Researchers studied liquid silica under high pressure and moderate temperatures. They found its structure becomes similar to solid silica phases as density increases, with silicon

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An Experimental Protocol for Studying Mineral Effects on Organic Hydrothermal Transformations

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Area of Science:

Materials Science
High-Pressure Physics
Plasma Physics

Background:

Understanding the behavior of materials under extreme conditions is crucial for various scientific fields.
Liquid silica (SiO2) under warm dense matter conditions presents unique structural challenges.

Purpose of the Study:

To investigate the structural properties of liquid silica at high pressures and moderate temperatures.
To determine how density affects the coordination number of silicon in liquid silica.

Main Methods:

Utilized time-resolved K-edge X-ray absorption spectroscopy.
Employed nanosecond and picosecond lasers for compression and X-ray generation.
Performed ab initio calculations for theoretical interpretation.

Main Results:

Observed liquid silica up to 3.6 times normal solid density.
Interpreted X-ray absorption near-edge structure changes with increasing density.
Determined an increase in silicon's coordination number from 4 to 9.

Conclusions:

The structure of liquid silica transitions towards solid-like phases at high densities and temperatures.
Coordination number increase indicates a significant structural change under compression.
Ab initio simulations successfully explained the experimental spectroscopic data.