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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...

Phase Transitions: Sublimation and Deposition

Phase Transitions: Sublimation and Deposition

Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...

Phase Transitions

Phase Transitions

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...

Phase Transitions

Phase Transitions

A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...

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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Related Experiment Video

Updated: May 30, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Pressure-induced structural phase transitions on Na(0.5)CoO(2): a first principles study.

Yanli Wang¹, Jun Ni

¹Department of Physics and Key Laboratory of Atomic and Molecular Nanoscience (Ministry of Education), Tsinghua University, Beijing 100084, People's Republic of China.

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

|August 10, 2011

Summary

Pressure induces a structural transformation in sodium cobalt oxide (Na(0.5)CoO(2)), leading to an insulator-metal transition. This transformation is driven by ion repulsion and strongly coupled with magnetic ordering changes.

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Area of Science:

Condensed Matter Physics
Materials Science
Computational Chemistry

Background:

Sodium cobalt oxide (Na(0.5)CoO(2)) is a material with interesting electronic and magnetic properties.
Understanding pressure effects is crucial for tailoring material behavior.

Purpose of the Study:

To investigate the impact of pressure on the structural, electronic, and magnetic properties of Na(0.5)CoO(2).
To elucidate the mechanisms behind the pressure-induced insulator-metal transition.

Main Methods:

First principles calculations were employed to simulate the material's response to varying pressure.
Analysis focused on structural, electronic, and magnetic property changes.

Main Results:

A novel sodium ion structural transformation was predicted under pressure.
Increased Coulomb repulsion between Na and Co ions was identified as the cause.
The structural transformation was found to induce the insulator-metal transition.
Strong coupling between sodium and cobalt magnetic ordering led to a subsequent magnetic phase transition.

Conclusions:

Pressure significantly alters the properties of Na(0.5)CoO(2) through a unique structural transformation.
The interplay between structural, electronic, and magnetic properties is key to understanding this material's behavior under pressure.