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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...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
Types of Semiconductors01:20

Types of Semiconductors

Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
Valence Bond Theory02:42

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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

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Updated: Jun 4, 2026

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Intrinsic defects and dopants in LiNH2: a first-principles study.

E Hazrati1, G Brocks, B Buurman

  • 1Radboud University Nijmegen, Institute for Molecules and Materials, Electronic Structure of Materials, Nijmegen, The Netherlands.

Physical Chemistry Chemical Physics : PCCP
|February 24, 2011
PubMed
Summary
This summary is machine-generated.

Lithium amide and lithium hydride offer promising lightweight hydrogen storage. Native defects, particularly Li-related ones, facilitate rapid diffusion, while hydride vacancies enable proton transport for efficient hydrogen release.

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Area of Science:

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

Background:

  • The lithium amide (LiNH(2)) + lithium hydride (LiH) system is a key candidate for lightweight hydrogen storage materials.
  • Dehydrogenation in this system relies on mass transport through lattice defects within the bulk amide crystal.

Purpose of the Study:

  • To investigate native point defects and dopants in LiNH(2) using first-principles calculations.
  • To understand the role of these defects in hydrogen storage properties.

Main Methods:

  • Density Functional Theory (DFT) was employed for first-principles calculations.
  • Analysis of native point defects (interstitials and vacancies) and dopant effects in LiNH(2).

Main Results:

  • Both Li-related (Li(i)(+), V(Li)(-)) and H-related (H(i)(+), V(H)(-)) defects are charged and significantly influence hydrogen storage.
  • Li-related defects are abundant with low diffusion barriers (0.3-0.5 eV), enabling rapid diffusion at moderate temperatures.
  • The hydride vacancy (V(H)(-)), corresponding to the [NH](2-) ion, is the dominant species for proton transport with a barrier of ~0.7 eV.

Conclusions:

  • Native defects, especially Li-related ones and the hydride vacancy, play critical roles in the hydrogen storage mechanism of LiNH(2).
  • Dopants like Mg and Ca can moderately alter defect concentrations, potentially influencing material performance.
  • Understanding these defects is crucial for optimizing LiNH(2) for hydrogen storage applications.