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Related Concept Videos

Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...

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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
06:26

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Published on: May 15, 2017

Disorder-induced localization in crystalline phase-change materials.

T Siegrist1, P Jost, H Volker

  • 1I. Physikalisches Institut (IA), RWTH Aachen University, 52056 Aachen, Germany.

Nature Materials
|January 11, 2011
PubMed
Summary
This summary is machine-generated.

Researchers discovered a metal-insulator transition in crystalline phase-change materials, driven by disorder, not electron correlation. This finding is key for reproducible resistance switching in non-volatile memory devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Physics

Background:

  • Metal-insulator transitions (MITs) in solids are crucial for electronic applications.
  • Distinguishing between electron correlation (Mott transition) and disorder (Anderson localization) mechanisms in MITs is challenging.
  • Crystalline materials exhibiting MIT without structural changes are of significant scientific interest.

Purpose of the Study:

  • To investigate the mechanism behind metal-insulator transitions in crystalline phase-change materials.
  • To explore the role of disorder in inducing MIT in these materials.
  • To understand the implications for resistance switching and non-volatile memory applications.

Main Methods:

  • Annealing crystalline phase-change materials at increasing temperatures.
  • Analyzing the electronic transport properties and degree of disorder.
  • Correlating structural properties with observed metal-insulator transitions.

Main Results:

  • A metal-insulator transition was observed upon increasing annealing temperature in crystalline phase-change materials.
  • The transition was attributed to strong disorder, typically found in amorphous solids, rather than electron correlation.
  • These materials exhibit a unique quantum state with pronounced disorder and weak electron correlation.

Conclusions:

  • Disorder-controlled metal-insulator transitions in crystalline materials offer a new pathway for understanding electronic behavior.
  • The universal electronic behavior due to disorder explains the reproducibility of resistance switching in non-volatile memory devices.
  • Controlling disorder levels in these materials could lead to multilevel resistance states for advanced storage technologies.