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Stacking faults and superstructures in a layered brownmillerite.

H Krüger¹, S Stöber, T R Welberry

¹Institute of Mineralogy and Petrography, University of Innsbruck, Innsbruck, Austria. hannes.krueger@uibk.ac.at

Acta Crystallographica. Section B, Structural Science

|November 22, 2011

Summary

This summary is machine-generated.

Single crystals of Ca4Fe2Mn0.5Ti0.5O9 were synthesized and characterized. Structural analysis revealed complex ordering and stacking faults, indicating two distinct superstructures within the material.

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Area of Science:

Solid-state chemistry
Crystallography
Materials science

Background:

Brownmillerite-type structures are known for their complex layering and potential for functional properties.
Understanding structural variations is crucial for tailoring material performance.

Purpose of the Study:

To synthesize and characterize single crystals of Ca4Fe2Mn0.5Ti0.5O9.
To elucidate the complex structural ordering and identify any superstructures present.

Main Methods:

Flux method for single crystal synthesis.
Single-crystal X-ray diffraction for structural determination.
Computer simulations to analyze diffuse scattering.
Selected-area electron diffraction for superstructure analysis.

Main Results:

The crystal structure was determined to be Amma, isotypic with Sr3NdFe3O9, featuring separated brownmillerite-type layers.
One-dimensional diffuse scattering indicated a doubled unit cell along c due to alternating tetrahedral chain ordering and stacking faults along b.
Computer simulations confirmed that intensity variations in diffuse scattering arise from two distinct local structures.
Electron diffraction revealed ordered regions with satellite reflections corresponding to two superstructures, described by superspace group A2(1)/m(0βγ)0s.

Conclusions:

The synthesized Ca4Fe2Mn0.5Ti0.5O9 exhibits complex structural features including stacking faults and two distinct superstructures.
The observed structural variations are attributed to the ordering of tetrahedral chains within the brownmillerite-type layers.
This detailed structural understanding provides a basis for further investigations into the properties and potential applications of this material.