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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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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Classification of Elements and Compounds02:54

Classification of Elements and Compounds

66.6K
Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond. Elements are classified as atomic or molecular based on the nature of their basic units.
Compounds are pure substances composed of two or more elements in fixed, definite proportions. Compounds are classified as ionic or molecular (covalent) based on the bonds...
66.6K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.6K
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. 
41.6K
Ionic Compounds: Formulas and Nomenclature03:34

Ionic Compounds: Formulas and Nomenclature

67.1K
An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
67.1K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

42.7K
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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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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NaGaPO4F - a KTiOPO4-structured solid sodium-ion conductor.

Sergey N Marshenya1, Artem D Dembitskiy1, Dmitry S Fedorov2,3

  • 1Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, 3 Nobel Street, 121205 Moscow, Russia. Sergey.Marshenya@skoltech.ru.

Dalton Transactions (Cambridge, England : 2003)
|November 10, 2023
PubMed
Summary
This summary is machine-generated.

We report a new sodium-ion conductor, NaGaPO4F, synthesized via a two-step method. This material exhibits 3D sodium diffusion and thermal stability, making it a promising candidate for advanced ionic conductor applications.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Energy Storage

Background:

  • Advanced ionic conductors are essential for technologies like solid-state ion batteries and fuel cells.
  • The KTiOPO4 structural family is known for its potential in ionic conductivity.

Purpose of the Study:

  • To synthesize and characterize a novel sodium-ion conducting material, NaGaPO4F.
  • To investigate the sodium-ion mobility and structural properties of NaGaPO4F.

Main Methods:

  • Facile two-step synthesis involving hydrothermal preparation and ion exchange.
  • Crystal structure refinement using synchrotron X-ray powder diffraction and electron diffraction tomography.
  • Investigation of Na-ion mobility via solid-state nuclear magnetic resonance (NMR) and density functional theory (DFT) calculations.

Main Results:

  • NaGaPO4F was synthesized for the first time and its crystal structure determined.
  • The material exhibits excellent thermal stability up to 450 °C with minimal cell volume expansion.
  • DFT and NMR studies revealed 3D sodium diffusion with low migration barriers (0.22-0.5 eV) and a bandgap of ~4.25 eV.

Conclusions:

  • NaGaPO4F is a thermally stable, novel sodium-ion conductor.
  • The 3D diffusion pathways and low migration barriers indicate its potential for fast sodium-ion conduction.
  • This discovery opens avenues for developing new materials for sodium-ion based energy storage devices.