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Related Concept Videos

Superconductor01:24

Superconductor

1.1K
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...
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Types Of Superconductors01:28

Types Of Superconductors

947
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
947
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

9.5K
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...
9.5K
Metallic Solids02:37

Metallic Solids

18.3K
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....
18.3K
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

1.3K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
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Superconductivity in Diamond-Like BC15.

Shicong Ding1, Li Zhu2, Xiaohua Zhang1

  • 1State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China.

Inorganic Chemistry
|September 25, 2024
PubMed
Summary
This summary is machine-generated.

Researchers discovered a new diamond-like boron-carbon compound, d-BC15, exhibiting high-temperature superconductivity and superhardness. This material shows a critical temperature of 43.6 K at ambient pressure, potentially reaching 75 K with doping.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Advancing the compositional space of known compound classes can lead to novel materials with unique properties, exemplified by the discovery of superconductors like LaH10.
  • Exploring binary systems is a key strategy for discovering new materials with enhanced functionalities.

Purpose of the Study:

  • To conduct a comprehensive first-principles structural search on the binary B-C system.
  • To identify new thermodynamically stable boron-carbon compounds with potential superconducting and mechanical properties.

Main Methods:

  • Utilized a comprehensive first-principles structural search to explore the B-C compositional space.
  • Performed density functional theory (DFT) calculations to predict structural, electronic, and mechanical properties.

Main Results:

  • Identified a diamond-like boron-carbon compound, d-BC15, which is thermodynamically superior to synthesized BC3 and BC5.
  • Predicted anisotropic superconductivity in d-BC15 with a critical temperature (Tc) of 43.6 K at ambient pressure, exceeding the McMillan limit.
  • Observed a maximum Tc of approximately 75 K at 0.43% hole doping due to enhanced density of states at the Fermi level.
  • Determined superhard characteristics for d-BC15, with a Vickers hardness of 75 GPa and high tensile (72 GPa) and shear (73 GPa) stresses.

Conclusions:

  • The newly discovered d-BC15 exhibits a remarkable combination of high-temperature superconductivity and superhardness.
  • This finding provides new avenues for designing multifunctional materials with tailored electronic and mechanical properties.