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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Ionic Bonding and Electron Transfer02:48

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.
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Related Experiment Video

Updated: Jun 22, 2026

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

Published on: October 1, 2019

Ion-exchangeable, electronically conducting layered perovskite oxyfluorides.

Yoji Kobayashi1, Mingliang Tian, Miharu Eguchi

  • 1Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.

Journal of the American Chemical Society
|June 25, 2009
PubMed
Summary

Researchers created novel fluorinated layered perovskites by substituting oxygen with fluorine. These new materials exhibit electronic conductivity and air stability, opening avenues for advanced functional materials.

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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Inorganic Chemistry

Background:

  • Layered perovskites offer versatile interlayer chemistry but often lack electronic/magnetic properties.
  • Mixed-valent perovskites possess interesting electronic/magnetic functionalities but limited interlayer chemistry.
  • A gap exists in developing layered perovskites with both tunable interlayer chemistry and desirable electronic properties.

Purpose of the Study:

  • To synthesize novel fluorinated layered perovskites by partially substituting oxygen with fluorine.
  • To impart electronic conductivity and air stability to cation-exchangeable layered perovskites.
  • To investigate the electronic transport properties of these new materials.

Main Methods:

  • Reaction of cation-exchangeable layered perovskites (RbLaNb(2)O(7), KCa(2)Nb(3)O(10), NaYTiO(4)) with poly(tetrafluoroethylene) under inert atmosphere.
  • Characterization of the resulting fluorinated perovskites, focusing on B-site cation reduction and anion sublattice integrity.
  • Electronic transport measurements, including conductivity and variable-range hopping analysis, on air-stable fluorinated compounds.

Main Results:

  • Successful synthesis of fluorinated layered perovskites with B-site cations in a mixed-valent state.
  • The fluorinated materials exhibit electronic conductivity and remarkable air and water stability.
  • Room-temperature conductivity was observed in RbLaNb(2)O(6)F (2-7 x 10(2) ohms x cm) via variable-range hopping, persisting after proton exchange.

Conclusions:

  • Partial fluorination is an effective strategy to introduce electronic conductivity into cation-exchangeable layered perovskites.
  • The resulting materials are air-stable, overcoming a key limitation of many conductive perovskites.
  • These findings enable the development of new functional materials with tunable properties for electronic applications.