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Related Experiment Videos

Ordered double perovskites -- a group-theoretical analysis.

Christopher J Howard1, Brendan J Kennedy, Patrick M Woodward

  • 1Australian Nuclear Science and Technology Organization, Private Mail Bag 1, Menai, NSW 2234, Australia. cjh@ansto.gov.au

Acta Crystallographica. Section B, Structural Science
|August 30, 2003
PubMed
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This study uses group-theory to identify 12 unique structures in ordered double perovskites (A(2)BB'X(6)). It combines cation ordering with octahedral tilting, providing a systematic classification for these complex materials.

Area of Science:

  • Crystallography
  • Materials Science
  • Solid-State Chemistry

Background:

  • Ordered double perovskites (A(2)BB'X(6)) exhibit complex structures due to cation ordering and octahedral tilting.
  • Understanding these structural variations is crucial for predicting material properties.

Purpose of the Study:

  • To systematically enumerate and classify the possible structures of ordered double perovskites.
  • To analyze the interplay between cation ordering and octahedral tilting using group-theoretical methods.

Main Methods:

  • Application of group-theoretical methods to analyze symmetry.
  • Utilizing irreducible representations (R(1)(+), M(3)(+), R(4)(+)) of the Pm3;m space group.
  • Enumeration of structures based on cation ordering and octahedral tilting patterns.

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Main Results:

  • Identification of 12 distinct ordered double perovskite structures.
  • Detailed description of group-subgroup relationships between identified structures.
  • Classification based on cation ordering (R(1)(+)) and octahedral tilting (M(3)(+), R(4)(+)).

Conclusions:

  • The study provides a comprehensive framework for understanding the structural diversity of ordered double perovskites.
  • The identified structures and their relationships offer insights for materials design and discovery.