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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.
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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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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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Local structures around the substituted elements in mixed layered oxides.

Shota Akama1, Wataru Kobayashi1,2,3,4, Kaoru Amaha1

  • 1Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba 305-8571, Japan.

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Summary

Chemical substitution in layered oxides improves material properties but causes lattice distortion. This study shows minority elements adjust their ionic radius and local environment to minimize this distortion, enhancing material stability.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Inorganic Chemistry

Background:

  • Chemical substitution is key to tuning material properties like electrochemical and magnetic performance.
  • Ionic radius differences during substitution induce local lattice distortions, impacting material functionality.
  • Layered transition metal oxides (NaMO2) are crucial functional materials where substitution effects are significant.

Purpose of the Study:

  • To systematically investigate local structural changes in Na(M1-xM'x)O2 layered oxides upon chemical substitution.
  • To quantify the impact of minority transition metal (M') incorporation on local interatomic distances and lattice distortion.
  • To understand the mechanism by which local structure adapts to minimize distortion.

Main Methods:

  • Extended X-ray Absorption Fine Structure (EXAFS) analysis was employed to probe local atomic environments.
  • Systematic investigation of pure (x=0.0) and mixed (x=0.05, 0.1) layered oxide compositions.
  • Analysis focused on local interatomic distances (dM-O) and coordination environments.

Main Results:

  • Local interatomic distances (dM-O) around minority elements adapt to match those of the majority element.
  • Incorporation of minority elements leads to reduced local lattice distortion.
  • The valence of minority elements, such as Mn, adjusts to minimize ionic radius discrepancies.

Conclusions:

  • Chemical substitution in layered oxides can be optimized by local structural adjustments.
  • Minority element valence and local coordination modify to reduce lattice strain.
  • Understanding these local structural adaptations is crucial for designing high-performance functional materials.