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Related Concept Videos

Metallic Solids02:37

Metallic Solids

18.6K
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....
18.6K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

27.3K
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...
27.3K
Superconductor01:24

Superconductor

1.2K
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
1.2K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.6K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.6K
Colors and Magnetism03:02

Colors and Magnetism

12.3K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.3K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

9.8K
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
Imagine taking a large number of identical...
9.8K

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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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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Superconductivity in Crystallographically Disordered LaHg6.4.

Yurii Prots1, Mitja Krnel1, Yuri Grin1

  • 1Max-Planck-Institut für Chemische Physik fester Stoffe, Nothnitzer Str. 40, Dresden01187, Germany.

Inorganic Chemistry
|September 2, 2022
PubMed
Summary
This summary is machine-generated.

Structural disorder influences superconductivity. Researchers studied lanthanum mercuride (LaHg6.4), finding it becomes superconducting at 2.4 K despite one-dimensional crystallographic disorder.

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Area of Science:

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

Background:

  • The relationship between structural disorder and superconductivity remains a complex area of research.
  • Investigating novel materials with unique structural properties is crucial for understanding superconductivity.

Purpose of the Study:

  • To investigate the superconducting properties of lanthanum mercuride (LaHg6.4).
  • To explore the influence of one-dimensional crystallographic disorder on the superconductivity of LaHg6.4.

Main Methods:

  • Advanced synthesis techniques to overcome challenges in preparing LaHg6.4.
  • Detailed crystallographic analysis to characterize the material's structure and disorder.
  • Physical property measurements to determine superconducting transition temperature (Tc).

Main Results:

  • LaHg6.4 exhibits superconductivity with a critical temperature (Tc) of 2.4 K.
  • The material crystallizes in a new structure type with significant one-dimensional disorder along the [001] channels.
  • Successful synthesis and characterization of LaHg6.4, a material previously difficult to study.

Conclusions:

  • One-dimensional structural disorder in LaHg6.4 does not preclude superconductivity.
  • This study provides new insights into the interplay between structural complexity and emergent superconducting properties.