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Related Concept Videos

Superconductor01:24

Superconductor

1.7K
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...
16.0K
Types Of Superconductors01:28

Types Of Superconductors

1.6K
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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Phase Diagrams02:39

Phase Diagrams

48.6K
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
48.6K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

19.8K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
19.8K
Phase Diagram01:19

Phase Diagram

6.9K
The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
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Updated: Jan 12, 2026

High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
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Superconductivity at 28 K in Sodium Graphite Intercalation Compound under High Pressure.

Guangchen Ma1,2, Yingying Wang1,3, Zefang Wang2

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Researchers discovered superconductivity in sodium carbide (NaC8) at 28 K and 14 GPa, a significant advance for high-temperature superconductors. This finding opens new avenues for exploring superconductivity in light-element compounds.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Graphite intercalation compounds (GICs) show superconductivity, with CaC6 exhibiting 15.1 K superconductivity.
  • Research on high-temperature superconductivity in GICs has stagnated for nearly two decades.
  • Superconductivity in high-stage GICs remains largely unexplored, with focus on first-stage compounds.

Purpose of the Study:

  • To investigate superconductivity in high-stage GICs.
  • To discover new high-temperature superconducting materials.
  • To explore sodium carbide as a potential high-temperature superconductor.

Main Methods:

  • Experimental discovery of superconductivity using resistance drop measurements.
  • Magnetic field dependence studies up to 6 T.
  • X-ray diffraction and crystal structure prediction.

Main Results:

  • Superconductivity observed in sodium carbide at a critical temperature (Tc) of approximately 28 K and 14 GPa.
  • Resistance showed a sharp drop, and Tc decreased characteristically under magnetic fields.
  • The superconducting material was identified as the second-stage GIC NaC8.
  • Upper critical field (μ0Hc2(0)) estimated at 8.8 T; coherence length at ~61.2 Å.

Conclusions:

  • Achieved long-sought high-Tc GICs, surpassing previous records.
  • Identified NaC8 as a high-stage GIC exhibiting significant superconductivity.
  • Opened a new research direction for high-temperature superconductors in light-element compounds.