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Related Concept Videos

Superconductor01:24

Superconductor

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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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Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

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Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
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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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Amides to Amines: LiAlH4 Reduction01:20

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Amide reduction with strong reducing agents like lithium aluminum hydride proceeds through a nucleophilic acyl substitution to form amines. Primary, secondary, and tertiary amides yield primary, secondary, and tertiary amines, respectively.
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.
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Carboxylic Acids to Primary Alcohols: Hydride Reduction01:17

Carboxylic Acids to Primary Alcohols: Hydride Reduction

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Carboxylic acids, upon reaction with strong reducing agents such as lithium aluminum hydride followed by hydrolysis, undergo reduction to form primary alcohols.
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Supercritical Fluid Chromatography01:18

Supercritical Fluid Chromatography

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Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
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1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
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Study on superconducting Li-Se-H hydrides.

BingYu Li1, WenHua Yang1, HaiLiang Chen1

  • 1College of Physics, Qingdao University, Qingdao, Shandong 266071, P. R. China. wencailu@jlu.edu.cn.

Physical Chemistry Chemical Physics : PCCP
|March 28, 2022
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Summary
This summary is machine-generated.

Researchers explored lithium selenium hydride structures under high pressure, discovering stable LiSeH4, LiSeH6, and LiSeH10. These compounds exhibit metallic properties and potential for superconductivity at high pressures.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • High-pressure research is crucial for discovering novel materials with unique properties.
  • Superconductivity in hydrides has garnered significant interest due to potential high critical temperatures.

Purpose of the Study:

  • To investigate the structural, stability, and superconducting properties of lithium selenium hydrides (LiSeHn, n=4-10) under high pressure (150-300 GPa).
  • To identify potential high-pressure superconducting materials within this system.

Main Methods:

  • Utilized the genetic algorithm (GA) for structure prediction.
  • Employed Density Functional Theory (DFT) calculations to determine stability and electronic properties.
  • Performed electron-phonon coupling calculations to assess superconductivity.

Main Results:

  • Identified three stable stoichiometries: LiSeH4, LiSeH6, and LiSeH10.
  • Discovered four metastable stoichiometries: LiSeH5, LiSeH7, LiSeH8, and LiSeH9.
  • Confirmed metallic behavior for C2 LiSeH4, Pmm2 LiSeH6, and C2 LiSeH10 above 150 GPa.
  • C2 LiSeH4 and Pmm2 LiSeH6 showed promising superconducting properties.

Conclusions:

  • C2 LiSeH4 and Pmm2 LiSeH6 are predicted to be superconductors with critical temperatures of 77 K at 200 GPa and 111 K at 250 GPa, respectively.
  • These findings highlight the potential of lithium selenium hydrides as high-pressure superconductors.