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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...
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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...
Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred to as...
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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...
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Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...

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Phase-Change Memory from Molecular Tellurides.

Florian M Schenk1, Till Zellweger2, Dhananjeya Kumaar1

  • 1Chemistry and Materials Design Group, Institute for Electronics, Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland.

ACS Nano
|December 20, 2023
PubMed
Summary

Researchers developed a scalable solution-processing method for phase-change memory (PCM) materials. This approach enables high-throughput synthesis of telluride inks for energy-efficient, advanced memory devices.

Keywords:
non-volatile memory devicesphase-change materialssolution-based engineeringtelluridesthin films

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Electronics

Background:

  • Phase-change memory (PCM) relies on material resistance states for data storage.
  • Advancing PCM requires novel materials and cost-effective fabrication.

Purpose of the Study:

  • To introduce a generalizable and scalable solution-processing method for synthesizing phase-change telluride inks.
  • To enable high-throughput material screening, enhance energy efficiency, and support advanced device architectures for PCM.

Main Methods:

  • Dissolving bulk tellurides (Sb2Te3, GeTe, Sc2Te3, TiTe2) to create molecular metal telluride inks.
  • Mixing binary inks to form ternary tellurides with controlled compositions (e.g., Ge-Sb-Te, Sc-Sb-Te).
  • Utilizing spin-coating and annealing to deposit high-quality, phase-pure telluride films with preferred orientation.

Main Results:

  • Demonstrated accurate composition control for binary and ternary telluride inks.
  • Achieved thickness-tunable films, nanoscale via infilling, and deposition on flexible substrates.
  • Fabricated prototype PCM devices with cyclable, non-volatile operation, showing competitive resistance contrast and low reset energy.

Conclusions:

  • Solution-processed telluride inks offer a scalable and versatile platform for PCM material development.
  • This method facilitates the creation of advanced PCM devices with improved performance and fabrication efficiency.
  • The approach paves the way for mainstream realization of PCM technology.