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Related Concept Videos

Phase Transitions02:31

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...
MOS Capacitor01:25

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

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...
Phase Transitions: Sublimation and Deposition02:33

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 Changes01:19

Phase Changes

Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
Phase Diagram01:19

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).

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Updated: May 21, 2026

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
09:49

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx

Published on: May 13, 2020

Nanoscale phase change memory materials.

Marissa A Caldwell1, Rakesh Gnana David Jeyasingh, H-S Philip Wong

  • 1Department of Chemistry, Stanford University, Stanford, CA 94305, USA.

Nanoscale
|June 29, 2012
PubMed
Summary
This summary is machine-generated.

Researchers are exploring nanoscale phase change memory materials to improve data storage. Scaling these materials to the nanoscale offers new ways to design advanced memory technologies.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Electronics

Background:

  • Phase change memory (PCM) materials utilize reversible crystalline-amorphous state transitions for data storage.
  • Metal chalcogenide compounds are key materials, with phase transition properties dictating memory performance.
  • Manipulating these properties is crucial for advancing PCM technology.

Purpose of the Study:

  • To review recent advancements in tuning phase change properties by scaling materials to the nanoscale.
  • To discuss fabrication and synthesis strategies for nanoscale PCM materials.
  • To explore the implications of nanoscale phase change materials for future memory devices.

Main Methods:

  • Review of recent scientific literature on nanoscale phase change memory materials.
  • Analysis of fabrication and synthesis techniques for producing these materials.
  • Discussion of experimental trends and theoretical considerations.

Main Results:

  • Scaling phase change materials to the nanoscale significantly impacts their transition properties.
  • Specific fabrication and synthesis strategies enable the creation of nanoscale PCM materials.
  • Emerging trends highlight the importance of dimensionality in material design.

Conclusions:

  • Nanoscale engineering offers new avenues for designing advanced phase change memory materials.
  • Understanding nanoscale trends is vital for the future of high-density memory technologies.
  • Integration challenges and opportunities exist for nanoscale PCM in switching devices.