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Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
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Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
Ionic Association01:28

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The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
Types Of Superconductors01:28

Types Of Superconductors

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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Valence Bond Theory

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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Defect Enabled Room Temperature Superionicity in 3D Covalent Mixed Ionic Electronic Conductor LiB3.

Shuangshuang Yang1, Jianfu Li1, Zhendong Guo1

  • 1School of Physics and Electronic Information, Yantai University, Yantai 264005, China.

The Journal of Physical Chemistry Letters
|June 11, 2026
PubMed
Summary

Lithium boride (LiB3) exhibits a superionic state with high ionic and electronic conductivity, making it promising for solid-state energy storage. Defect engineering further enhances its performance by lowering the transition temperature.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Computational Materials Science

Background:

  • Mixed ionic-electronic conductors (MIECs) are crucial for energy applications but often suffer from low ionic conductivity and limited operating temperatures.
  • Developing intrinsic MIECs with enhanced transport properties and stability is a key challenge in materials science.

Purpose of the Study:

  • To investigate the ionic diffusion and coupled transport properties of LiB3 using first-principles calculations and machine learning molecular dynamics (MLMD).
  • To explore the potential of LiB3 as a high-performance material for solid-state energy storage applications.

Main Methods:

  • First-principles calculations were employed to understand fundamental material properties.
  • Machine learning molecular dynamics (MLMD) simulations were used to explore ionic diffusion and transport over a wide temperature range.
  • Defect engineering, specifically introducing vacancies, was utilized to modulate material properties.

Main Results:

  • LiB3 exhibits a superionic state at 800 K with high ionic conductivity (0.254 S/cm) and excellent electronic conductivity (10^3-10^4 S/cm).
  • The material demonstrates remarkable structural stability, with only 2.93% volume expansion from 0-800 K.
  • Introducing 6.25% vacancies reduced the superionic transition temperature to 300 K while maintaining high ionic conductivity (0.249 S/cm).

Conclusions:

  • LiB3 is identified as an intrinsic MIEC material with a unique combination of fast ionic and high electronic conductivity.
  • The material's stability and tunable properties through defect engineering highlight its significant potential for advanced solid-state energy storage systems.