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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Phase Transitions: Melting and Freezing02:39

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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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...
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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 Diagram01:19

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5.9K
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).
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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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Caloric materials near ferroic phase transitions.

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Materials exhibiting magnetocaloric, electrocaloric, and mechanocaloric effects show significant temperature changes near phase transitions when subjected to external fields. This study compares these phenomena for cooling applications.

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Area of Science:

  • Thermodynamics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Ferroic materials exhibit phase transitions influenced by external fields.
  • Order parameter modification drives thermal changes in responsive materials.
  • Magnetocaloric, electrocaloric, and mechanocaloric effects are key phenomena.

Purpose of the Study:

  • To compare magnetocaloric, electrocaloric, and mechanocaloric effects.
  • To analyze their history, experimental methods, and performance.
  • To evaluate prospective cooling applications.

Main Methods:

  • Review of existing literature and experimental data.
  • Comparative analysis of different caloric effects.
  • Assessment of material responses to conjugate fields.

Main Results:

  • Significant thermal changes observed near ferroic phase transitions.
  • Varied performance and methodologies across different caloric effects.
  • Potential for advanced cooling technologies identified.

Conclusions:

  • Caloric effects offer promising avenues for solid-state cooling.
  • Understanding material response to fields is crucial for optimization.
  • Further research needed to enhance efficiency and scalability.