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Phase Diagram

Phase Diagram

The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).

Phase Diagram

Phase Diagram

A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. It shows the boundaries between solid, liquid, and gas phases and the conditions at which these phases coexist in equilibrium. An area in a phase diagram represents a single phase, whereas lines or phase boundaries represent the equilibrium between two phases.In the phase diagram of water, the boundary line between the solid and liquid states illustrates...

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Phase Transitions: Melting and Freezing

Phase Transitions: Melting and Freezing

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Transition Zone

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The transition zone in concrete is a critical area where aggregate meets cement paste, marked by a distinct porosity and weakness compared to the surrounding material. The adhesion around the aggregates is primarily due to Van Der Waals forces. The voids within this zone influence its robustness; initially, it is less durable than the surrounding bulk mortar due to larger voids. Initially, when concrete is compacted, a higher water-cement ratio near the aggregates leads to the formation of...

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...

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Related Experiment Video

Updated: May 16, 2026

$Stress Distribution During Cold Compression of Rocks and Mineral Aggregates Using Synchrotron-based X-Ray Diffraction$

Stress Distribution During Cold Compression of Rocks and Mineral Aggregates Using Synchrotron-based X-Ray Diffraction

Published on: May 20, 2018

Structural phase transitions on AgCuS stromeyerite mineral under compression.

D Santamaria-Perez¹, A Morales-Garcia, D Martinez-Garcia

¹Departamento de Química-Física I, Universidad Complutense de Madrid, Avenida Complutense s/n, 28040 Madrid, Spain. dsantamaria@quim.ucm.es

Inorganic Chemistry

|December 19, 2012

Summary

Mineral stromeyerite (AgCuS) undergoes two high-pressure phase transitions, revealing a stronger metallic behavior in its high-pressure phases. These structural changes were analyzed using X-ray diffraction and computational methods.

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Area of Science:

Mineralogy
Materials Science
Solid State Physics

Background:

Stromeyerite (AgCuS) is a mineral with a complex crystal structure.
Understanding its behavior under pressure is crucial for materials science applications.

Purpose of the Study:

To investigate the structural behavior of stromeyerite under high hydrostatic pressure.
To identify and characterize pressure-induced phase transitions in AgCuS.

Main Methods:

Angle-dispersive X-ray diffraction measurements up to 13 GPa.
Ab initio total-energy calculations.

Main Results:

Two high-pressure phase transitions observed at 1.4 GPa and 5.7 GPa.
Initial phase (RP) transforms to anti-PbClF-type (HP1), then to a monoclinic distortion (HP2).
Observed collapse in metal-metal distances at RP-HP1 transition indicates enhanced metallic character.

Conclusions:

The study elucidates the high-pressure structural sequence of stromeyerite.
Experimental and computational results agree, providing chemical insights into AgCuS under pressure.