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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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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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Some materials may easily let electrical charges pass through them, while others obstruct their flow. The former are called conductors and the latter insulators. The atomic structures of materials determine whether they are conductors or insulators of electricity.
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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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2D CdPS3-based versatile superionic conductors.

Xin Yu1,2, Wencai Ren3,4

  • 1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, P. R. China.

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|July 6, 2023
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New superionic conductors based on cadmium thiophosphate (CdPS3) nanosheets enable high conductivity for both monovalent and multivalent ions across a wide temperature range, advancing nanochannel ion transport applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Ion transport in nanochannels is vital for life science, filtration, and energy storage.
  • Multivalent ion transport is challenging due to steric effects and strong wall interactions, with mobility decreasing at lower temperatures.
  • Existing solid ionic conductors (SICs) achieve practical conductivities only for monovalent ions above 0°C.

Purpose of the Study:

  • To develop versatile superionic conductors capable of high ion conductivity for both monovalent and multivalent ions.
  • To investigate the performance of monolayer CdPS3 nanosheets intercalated with diverse cations as advanced ionic conductors.
  • To explore the underlying mechanisms responsible for enhanced ion transport in these novel materials.

Main Methods:

  • Fabrication of monolayer CdPS3 nanosheets intercalated with various cations (e.g., K+, Na+, Li+, Ca2+, Mg2+, Al3+).
  • Measurement of ion conductivity across a broad temperature range (-30°C to 90°C).
  • Analysis of cation density and structural properties of the intercalated nanosheets.

Main Results:

  • Achieved superhigh ion conductivities (0.01 to 0.8 S/cm) for both monovalent and multivalent ions, surpassing existing SICs by one to two orders of magnitude.
  • Demonstrated consistent high conductivity across a wide temperature range (-30°C to 90°C).
  • Identified high-density cation concentration (up to ~2 nm⁻²) in well-ordered nanochannels as the source of high conductivity.

Conclusions:

  • Monolayer CdPS3 nanosheets intercalated with diverse cations represent a breakthrough in superionic conductor design.
  • These materials offer unprecedented conductivity for various ions, overcoming limitations of previous SICs.
  • The findings open new avenues for designing advanced ionic conductors and exploring novel nanofluidic phenomena.