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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Exploring the Underlying Correlation between the Structure and Ionic Conductivity in Halide Spinel Solid-State

Jiangyang Pan1,2, Lei Gao3, Xinyu Zhang2

  • 1Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, China.

Inorganic Chemistry
|February 7, 2024
PubMed
Summary
This summary is machine-generated.

Researchers explored how crystal structure affects ionic conductivity in halide spinel solid-state electrolytes (SSEs). They found specific crystal parameters non-monotonically influence Li+ transport, crucial for battery development.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Electrochemistry

Background:

  • Understanding the structure-ionic conductivity relationship in solid-state electrolytes (SSEs) is vital for advanced battery technologies.
  • The complex interplay of crystal parameters in SSEs makes discerning their effect on ion transport challenging.

Purpose of the Study:

  • To systematically investigate the structure-function relationship in halide spinel LiMgCl2+ SSEs.
  • To elucidate how various crystal parameters collectively influence lithium-ion (Li+) transport and conductivity.

Main Methods:

  • Synthesis and characterization of LiMgCl2+ SSEs across a range of compositions (2 ≥ x ≥ 1).
  • Neutron diffraction experiments coupled with Rietveld refinement.
  • Mechanistic analysis of Li+ transport pathways.

Main Results:

  • A nonmonotonic trend in ionic conductivity was observed, peaking at 8.69 × 10-6 S cm-1 for x = 1.4.
  • Rietveld refinement revealed diverse roles of cell parameters, Li+ vacancies, Debye-Waller factor, and Li-Cl bond length in conductivity.
  • Li+ transport predominantly occurs via three-dimensional pathways.

Conclusions:

  • The study highlights the collective influence of multiple crystal parameters on Li+ transport in halide spinel SSEs.
  • These findings provide critical insights for designing SSEs with enhanced ionic conductivity for energy storage applications.