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Related Concept Videos

Phase Transitions02:31

Phase Transitions

23.1K
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...
23.1K
Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

20.0K
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...
20.0K
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

15.0K
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...
15.0K
Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

20.9K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
20.9K
Inductance: Single-Phase And Three-Phase Line01:28

Inductance: Single-Phase And Three-Phase Line

618
Understanding the inductance of transmission lines is crucial for efficient design and operation in electrical power systems. This discussion delves into the inductance characteristics of single-phase two-wire and three-phase three-wire transmission lines with equal phase spacing.
Single-Phase Two-Wire Line:
A single-phase line consists of two solid cylindrical conductors, denoted as x and y. Each conductor carries phasor currents ix and iy, respectively. Given that the sum of these currents is...
618
Capacitance: Single-Phase And Three-Phase Line01:25

Capacitance: Single-Phase And Three-Phase Line

597
In electrical power systems, understanding the capacitance of transmission lines is fundamental for efficient operation.
Single-Phase Lines
Consider a single-phase, two-wire transmission line with equal phase spacing energized by a voltage source. One conductor carries a uniform positive charge, while the other carries an equal negative charge. The capacitance C of the line can be derived from the voltage V between the conductors. For a one-meter section of the line, the capacitance is given...
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Analysis of Contact Interfaces for Single GaN Nanowire Devices
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An electrically driven structural phase transition in single Ag2Te nanowire devices.

Kasun Premasiri1, Wei Zheng, Biao Xu

  • 1Department of Physics, Case Western Reserve University, Cleveland, OH 44106, USA. xuan.gao@case.edu.

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Silver telluride (Ag2Te) nanowires exhibit reversible phase transitions, enabling their use in electronic memory. Low voltage electrical pulses can trigger these transitions, paving the way for low-power nanoscale devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Advancing electronic memory devices relies on discovering novel phase-change materials.
  • Silver telluride (Ag2Te) nanowires show promise for nanoscale memory due to their reversible structural phase transition.

Purpose of the Study:

  • To investigate the temperature- and electrically-driven phase change properties of crystalline Ag2Te nanowires.
  • To assess the potential of Ag2Te nanowires for low voltage, low power nanoscale memory applications.

Main Methods:

  • Fabrication and characterization of Ag2Te nanowires.
  • Inducing phase transitions via external heating.
  • Triggering phase transitions using low DC voltage (<1 V) induced Joule heating.

Main Results:

  • A sharp drop in conductance was observed upon heating the Ag2Te nanowires, indicating a structural phase change.
  • Electrical stimulation with DC voltage below 1 V successfully induced the phase transition via Joule heating.
  • The phase transition in Ag2Te nanowires is reversible.

Conclusions:

  • Ag2Te nanowires demonstrate viable temperature- and electrically-driven phase change properties.
  • The ability to induce phase transitions with low voltage makes Ag2Te nanowires suitable for low-power nanoscale memory devices.