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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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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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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.
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Tetrahedral Complexes
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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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Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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Ionically Conducting Two-Dimensional Heterostructures.

Xiangxin Guo1, Joachim Maier2

  • 1Key Laboratory of Transparent and Opto-functional Inorganic Materials Shanghai Institute of Ceramics, Chinese Academy of Sciences 1295 Ding Xi Road, Shanghai 200050 (P. R. China).

Advanced Materials (Deerfield Beach, Fla.)
|February 8, 2023
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Summary
This summary is machine-generated.

Ionic heterostructures, thin films with defined geometry, reveal crucial interfacial effects on ion conduction. This review covers recent progress in halides and oxides, highlighting fundamental and technological relevance.

Keywords:
ConfinementInterfacesIonic heterostructuresNanoionicsSpace charge effects

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Physics

Background:

  • Thin films offer defined geometry crucial for studying interfacial effects on ion conduction.
  • Heterostructures provide symmetric boundary conditions and a high density of interfaces, making them ideal for such studies.
  • Understanding ion transport at interfaces is key for advanced energy storage and electronic devices.

Purpose of the Study:

  • To review recent advancements in the field of ionic heterostructures.
  • To discuss the impact of interfacial effects on ion conduction in these materials.
  • To highlight the fundamental importance and technological relevance of this nascent field.

Main Methods:

  • Review of existing literature on ionic heterostructures.
  • Analysis of studies focusing on ion conduction mechanisms in thin films.
  • Categorization of materials including halides and oxides with varying disorder and mobility.

Main Results:

  • Ionic heterostructures exhibit significant interfacial effects influencing ion conduction.
  • Materials studied include a range of halides and oxides with diverse ionic mobilities.
  • The field, though young, has already yielded results of fundamental and technological importance.

Conclusions:

  • Ionic heterostructures are a promising platform for fundamental research into ion conduction.
  • Interfacial effects play a critical role in the overall ionic conductivity of these systems.
  • The field holds significant potential for technological applications, particularly in energy storage.