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Ca3Mn2O7.

Nicolas Guiblin1, Dominique Grebille, Henri Leligny

  • 1Laboratoire CRISMAT, ISMRA et Université de Caen, 6 Boulevard du Maréchal Juin, 14050 Caen CEDEX, France. guiblin@ismra.fr

Acta Crystallographica. Section C, Crystal Structure Communications
|January 10, 2002
PubMed
Summary

The crystal structure of tricalcium dimanganese heptaoxide (Ca3Mn2O7) was re-evaluated. Previously thought to be tetragonal, it is now confirmed as orthorhombic with a refined crystal structure.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Crystallography

Background:

  • The Ruddlesden-Popper series Ca(n+1)Mn(n)O(3n+1) includes Ca3Mn2O7 (n=2).
  • Previous reports described Ca3Mn2O7 with an I-centered tetragonal lattice.
  • Accurate structural characterization is crucial for understanding material properties.

Purpose of the Study:

  • To re-determine and refine the crystal structure of tricalcium dimanganese heptaoxide (Ca3Mn2O7).
  • To investigate potential discrepancies in previous crystallographic data.
  • To compare the refined structure with the parent perovskite CaMnO3.

Main Methods:

  • Single-crystal X-ray diffraction was employed for structural analysis.
  • The crystal structure was refined assuming the presence of twin domains.
  • Space group determination and lattice parameter refinement were performed.

Main Results:

  • Tricalcium dimanganese heptaoxide (Ca3Mn2O7) exhibits an orthorhombic crystal structure.
  • The refined lattice is A-centered with parameters a = 5.2347(6), b = 5.2421(2), and c = 19.4177(19) Å.
  • The structure was refined in space group A2(1)am.

Conclusions:

  • The crystallographic description of Ca3Mn2O7 is revised from tetragonal to orthorhombic.
  • The refined structure provides a more accurate basis for understanding its properties.
  • Further comparison with the CaMnO3 perovskite structure is warranted.

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