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Ammonium scandium tetrafluoride.

Nicholas F Stephens1, Philip Lightfoot

  • 1School of Chemistry, University of St Andrews, Fife KY16 9ST, Scotland.

Acta Crystallographica. Section C, Crystal Structure Communications
|December 7, 2006
PubMed
Summary

Researchers describe the novel layered perovskite NH4ScF4, featuring anionic [ScF4]- sheets stabilized by ammonium cations. This fluoride structure is analogous to oxide-based Dion-Jacobson materials.

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Materials science

Background:

  • Layered perovskite structures offer unique properties.
  • Fluoride analogues of oxide materials are of interest.
  • Understanding new AMF4 compounds expands structural diversity.

Purpose of the Study:

  • To characterize the novel compound NH4ScF4.
  • To elucidate its layered perovskite-like structure.
  • To compare its structure to known oxide families.

Main Methods:

  • Single-crystal X-ray diffraction.
  • Structural analysis.
  • Comparison with related materials.

Main Results:

  • NH4ScF4 crystallizes in a layered structure.
  • It features corner-sharing ScF6 octahedra forming [ScF4]- sheets.
  • Ammonium cations bridge layers via hydrogen bonding.

Conclusions:

  • NH4ScF4 is a new member of the AMF4 family.
  • Its structure is a single-layer fluoride analogue of Dion-Jacobson oxides.
  • This finding contributes to the understanding of layered fluoride materials.

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