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Related Concept Videos

Phase Diagrams02:39

Phase Diagrams

50.1K
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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Phase Diagram01:19

Phase Diagram

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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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Energy Diagrams - II01:10

Energy Diagrams - II

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Energy diagrams are important to understand the dynamics of a system. The topology of an energy diagram helps illustrate the equilibrium points of the system.
The point in the energy diagram at which the system’s potential energy is the lowest is known as the local minima. The system tends to stay in this position indefinitely unless acted upon by a net force. The slope of the potential energy diagram at the local minima is zero, indicating that zero net force is acting on the system. The...
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Free-body Diagram01:28

Free-body Diagram

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In mechanics, understanding the motion of objects is essential, and one tool that helps solve this problem is the free-body diagram. It is a simple but powerful graphical representation that succinctly represents all the forces acting on an object. A free-body diagram can represent a stationary or moving object, and is used in mechanics to explain the cause of an object's motion.
A free-body diagram transforms a complex problem into a simple representation, making it easy to understand the...
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Shear Diagram01:27

Shear Diagram

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In the study of beam mechanics, shear diagrams play a crucial role in understanding the distribution of shear forces along the length of a beam. Consider a beam AB that is supported at both ends and subjected to perpendicular loads.
First, a free-body diagram of the beam is drawn, representing all the external forces and internal reactions acting on the beam. One can calculate the reaction forces at each support by employing the equilibrium equations of force and moment. The vertical component...
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pV-Diagrams01:18

pV-Diagrams

6.2K
The pV diagram, which is a graph of pressure versus volume of the gas under study, is helpful in describing certain aspects of the substance. When the substance behaves like an ideal gas, the ideal gas equation describes the relationship between its pressure and volume. On a pV diagram, it is common to plot an isotherm, which is a curve showing p as a function of V with the number of molecules and the temperature fixed. Then, for an ideal gas, the product of the pressure of the gas and its...
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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
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Engineering Topological Superlattices and Phase Diagrams.

Pavel P Shibayev, Elio J König, Maryam Salehi

  • 1Center for Functional Nanomaterials , Brookhaven National Lab , Upton , New York 11973 , United States.

Nano Letters
|January 22, 2019
PubMed
Summary

Researchers created phase diagrams for topological superlattices using bismuth selenide and indium selenide. This work bridges theory and experiment, enabling new artificial topological phases.

Keywords:
Superlatticesphase diagramstopological insulatorsweak antilocalization

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Area of Science:

  • Quantum materials research
  • Condensed matter physics
  • Materials science

Background:

  • Topological materials research seeks novel quantum states.
  • Superlattices offer a route to new topological phases beyond thermodynamic limits.
  • A gap exists between theoretical predictions and experimental realization of topological superlattices.

Purpose of the Study:

  • To experimentally verify phase diagrams of topological superlattices.
  • To investigate the electronic properties of superlattices made from topological and normal insulators.
  • To bridge the gap between theory and experiment in topological materials.

Main Methods:

  • Fabrication of superlattices using molecular-level control.
  • Low-temperature magnetotransport measurements.
  • Field theoretical calculations.

Main Results:

  • First experimentally verifiable phase diagrams for topological superlattices (Bi2Se3/In2Se3).
  • Demonstrated evolution of electronic properties with unit-layer thickness.
  • Utilized weak antilocalization to analyze conducting channel evolution.

Conclusions:

  • This study provides a framework for creating artificial topological phases.
  • The findings facilitate the design of novel topological heterostructures.
  • Future work can combine topological materials with superconductors or magnetic materials.