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Phase Diagram01:19

Phase Diagram

7.2K
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).
7.2K
Phase Diagram01:24

Phase Diagram

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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 Diagrams02:39

Phase Diagrams

51.5K
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...
51.5K
Phase Transitions02:31

Phase Transitions

23.6K
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...
23.6K
Phase Transitions01:21

Phase Transitions

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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...
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Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

20.8K
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...
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Pressure-induced phase transitions in Co3O4: a first-principles study.

Yaping Xie1,2, Ming Li2, Cong Li1,3

  • 1Key Laboratory of Intelligent Optoelectronic Devices and Chips of Jiangsu Higher Education Institutions, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou, 215009, China. cong.li@usts.edu.cn.

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Cobalt oxide (Co3O4) undergoes significant structural and magnetic changes under high pressure. High pressure drives transitions from antiferromagnetic to ferromagnetic states, followed by magnetic collapse in new phases.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Cobalt oxide (Co3O4) is a crucial transition-metal oxide with significant applications in catalysis and energy storage.
  • Understanding its behavior under extreme conditions like high pressure is vital for exploring new functionalities.

Purpose of the Study:

  • To systematically investigate the structural stability, phase transitions, magnetic evolution, and electronic properties of Co3O4 under high pressure (0-100 GPa).
  • To elucidate the interplay between crystal structure, coordination environment, and magnetism in Co3O4.

Main Methods:

  • Utilized evolutionary *ab initio* structural searches combined with first-principles calculations.
  • Analyzed structural stability, phase transitions, magnetic states, and electronic properties across a wide pressure range.

Main Results:

  • Identified pressure-induced phase transitions from cubic *Fd*3̄*m* to orthorhombic *Fddd* and subsequently to monoclinic *P*21/*c* structures.
  • Observed a pressure-driven evolution of magnetic ground state from antiferromagnetic to ferromagnetic, followed by magnetic collapse.
  • Detailed the role of Co-O hybridization, 3d bandwidth, and coordination changes in driving these transitions.

Conclusions:

  • Established a comprehensive temperature-pressure phase diagram for Co3O4.
  • Demonstrated the intrinsic coupling between crystal structure, coordination, and magnetism under pressure.
  • Provided insights into high-pressure phase transitions in spinel-type transition-metal oxides.