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High Temperature Fabrication of Nanostructured Yttria-Stabilized-Zirconia (YSZ) Scaffolds by In Situ Carbon Templating Xerogels

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Tetra-yttrium difluoride disilicate orthosilicate, Y4F2[Si2O7][SiO4].

Marion C Schäfer¹, Ingo Hartenbach, Thomas Schleid

¹Department of Chemistry and Biochemistry, University of Delaware, 304A Drake Hall, Newark, DE 19716, USA ; Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.

Acta Crystallographica. Section E, Structure Reports Online

|October 8, 2013

Summary

The crystal structure of Y4F2[Si2O7][SiO4] reveals distinct anionic silicate units and cationic yttrium-fluoride entities. These building blocks arrange in a unique layer-like structure, offering insights into complex inorganic materials.

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Area of Science:

Crystal Chemistry
Inorganic Materials Science
Solid-State Chemistry

Background:

Understanding complex inorganic structures is crucial for materials development.
Silicate and fluoride compounds exhibit diverse structural motifs.
Yttrium-based materials are of interest for various applications.

Purpose of the Study:

To elucidate the detailed crystal structure of Y4F2[Si2O7][SiO4].
To identify and characterize the fundamental building blocks within the crystal lattice.
To describe the coordination environment of yttrium cations and the arrangement of anionic units.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the crystal structure.
Analysis of bond lengths, coordination numbers, and polyhedral arrangements.
Visualization of the three-dimensional structural framework.

Main Results:

The structure comprises anionic disilicate ([Si2O7](6-)) and orthosilicate ([SiO4](4-)) units.
Cationic [F2Y4](10+) entities, formed by edge-sharing [FY3](8+) triangles, are present.
Yttrium cations exhibit coordination numbers of seven and eight with oxide and fluoride anions.
The overall structure is characterized by layer-like arrangements parallel to the ac plane.

Conclusions:

The crystal structure of Y4F2[Si2O7][SiO4] is defined by the interplay of silicate anions and yttrium-fluoride cations.
The identified building blocks and their arrangement provide a new structural model for related compounds.
The layer-like motif offers potential for anisotropic material properties.