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Related Concept Videos

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...
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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...
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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...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

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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...
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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...
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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Two-dimensional melting under quenched disorder.

Sven Deutschländer1, Tobias Horn, Hartmut Löwen

  • 1Fachbereich für Physik, Universität Konstanz, D-78464 Konstanz, Germany.

Physical Review Letters
|September 17, 2013
PubMed
Summary
This summary is machine-generated.

Disordered colloidal particles show a broader hexatic phase during two-dimensional melting. Increasing disorder shifts the hexatic-solid transition to lower temperatures, confirming continuous phase transitions.

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Area of Science:

  • Condensed Matter Physics
  • Soft Matter Physics
  • Colloidal Science

Background:

  • Two-dimensional melting is a fundamental phase transition.
  • Superparamagnetic colloidal particles offer a model system for studying phase behavior.
  • Quenched disorder can significantly alter phase transition dynamics.

Purpose of the Study:

  • To investigate the effect of quenched disorder on the two-dimensional melting of superparamagnetic colloidal particles.
  • To explore the stability and characteristics of the hexatic phase under disorder.
  • To confirm the Kosterlitz-Thouless-Halperin-Nelson-Young (KTHNY) melting scenario in a disordered system.

Main Methods:

  • Video microscopy to observe particle dynamics.
  • Computer simulations of repulsive parallel dipoles.
  • Introduction of quenched disorder by pinning a fraction of particles.

Main Results:

  • Confirmation of the KTHNY melting scenario and observation of an intermediate hexatic phase.
  • The fluid-hexatic transition is largely unaffected by disorder.
  • The hexatic-solid transition shifts to lower temperatures with increasing disorder, broadening the hexatic phase stability range.
  • Observation of spatiotemporal critical-like fluctuations consistent with continuous phase transitions.

Conclusions:

  • Quenched disorder broadens the stability of the hexatic phase in two-dimensional colloidal melting.
  • Disorder influences the hexatic-solid transition more than the fluid-hexatic transition.
  • The phase transitions observed are continuous, without characteristics of first-order transitions.