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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

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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...
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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
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Ionic Crystal Structures

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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.
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Superconductor01:24

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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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Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Resonance02:52

Resonance

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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
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Modulated Structure Calculated for Superconducting Hydrogen Sulfide.

Arnab Majumdar1, John S Tse1, Yansun Yao1

  • 1Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada.

Angewandte Chemie (International Ed. in English)
|July 22, 2017
PubMed
Summary
This summary is machine-generated.

High-pressure hydrogen sulfide exhibits a novel modulated structure with high proton mobility. This finding offers new insights into the origins of high-temperature superconductivity in materials.

Keywords:
density functional theoryhigh-pressure chemistryhigh-temperature superconductivityhydrogen sulfidesuperconductivity

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Chemistry

Background:

  • Hydrogen sulfide (H₂S) under high pressure is a key material for studying high-temperature superconductivity.
  • Understanding the atomic structure and dynamics is crucial for explaining its superconducting properties.

Purpose of the Study:

  • To elucidate the complex modulated structure of compressed hydrogen sulfide.
  • To investigate the relationship between structure, proton mobility, and superconductivity.

Main Methods:

  • First-principles metadynamics calculations.
  • Molecular dynamics simulations.
  • Comparison of calculated diffraction patterns with experimental data.

Main Results:

  • A novel modulated structure was revealed, featuring meandering SH⁻ chains and H₃S⁺ units.
  • High proton mobility was observed within this structure.
  • The calculated diffraction pattern closely matched experimental observations.

Conclusions:

  • The discovered structure provides a new framework for understanding high-temperature superconductivity in hydrogen sulfide.
  • Fluxional motions of H₃S⁺ likely influence conducting electrons in SH⁻ chains, leading to strong electron-phonon coupling and superconductivity.