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Complex ceramic structures. I. Weberites.

Lu Cai¹, Juan C Nino

¹Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611-6400, USA.

Acta Crystallographica. Section B, Structural Science

|May 23, 2009

Summary

This summary is machine-generated.

Weberite (A2B2X7) is a versatile crystal structure related to fluorite. Its unique anion deficiency allows diverse cation accommodation, leading to varied properties and technological applications.

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Area of Science:

Crystallography
Materials Science

Background:

Weberite (A2B2X7) is an anion-deficient superstructure related to fluorite.
The reduced anion count alters cation coordination, enabling diverse ion incorporation.

Purpose of the Study:

To comprehensively summarize weberite structural features.
To introduce novel methods for representing the weberite structure.
To explore crystallographic relationships with related structures like pyrochlore.

Main Methods:

Structural analysis of weberite compounds.
Introduction of stacking vector and stacking angle for structural representation.
Crystallographic comparison with fluorite and pyrochlore structures.

Main Results:

Weberite's structure is described using novel stacking parameters.
Cation sublattices of weberite and pyrochlore are linked via axial transformation.
Anion coordination differences arise from alternating cation layer arrangements (AB3 and A3B).

Conclusions:

A stability field for weberite oxides is proposed based on ionic radius ratio and bond ionicity.
Weberite compounds exhibit diverse properties and significant technological potential.
This work provides a deeper understanding of weberite crystallography and its relationships to other structures.