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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...

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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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A-site-ordered perovskites with intriguing physical properties.

Yuichi Shimakawa1

  • 1Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan. shimak@scl.kyoto-u.ac.jp

Inorganic Chemistry
|September 30, 2008
PubMed
Summary

New perovskite oxides with A-site ordering exhibit unique physical properties. High pressure and temperature stabilize copper ions, creating a distinct structural framework crucial for these intriguing characteristics.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Crystallography

Background:

  • Perovskite structures are known for diverse physical properties.
  • A-site ordering introduces novel structural arrangements.
  • Jahn-Teller ions, like Cu(2+), significantly influence material behavior.

Purpose of the Study:

  • To review recent findings on A-site-ordered perovskite oxides.
  • To highlight the role of specific ions and structural features.
  • To explain the origins of intriguing physical properties.

Main Methods:

  • Review of existing literature and experimental findings.
  • Analysis of structural data under high-pressure and high-temperature conditions.
  • Investigation of electronic and magnetic properties influenced by A-site ordering.

Main Results:

  • High-pressure and high-temperature conditions stabilize square-coordinated Jahn-Teller Cu(2+) ions.
  • A unique structural framework arises from perpendicularly aligned A'O4 units.
  • Cu(2+) ions at the A' site and A'-B interactions are key to diverse properties.

Conclusions:

  • A-site-ordered perovskites offer a platform for novel materials.
  • Stabilization of specific ionic configurations under extreme conditions is critical.
  • Understanding structure-property relationships is essential for designing new functional oxides.