Commensurate Nb₂Zr₅O₁₅: Accessible Within the Field Nb₂ZrₓO₂ₓ₊₅ After All

Graphischer Abstract

Abstract

Doped niobium zirconium oxides are applied in field-effect transistors and as special-purpose coatings. Whereas their material properties are sufficiently known, their crystal structures remain widely uncharacterized. Herein, we report on the comparably mild sol-gel synthesis of Nb2Zr5O15 and the elucidation of its commensurately modulated structure via neutron diffraction. We describe the structure using the most appropriate superspace as well as the convenient supercell approach. It is part of an α-PbO2-homeotypic field with the formula Nb2ZrxO2x + 5, which has previously been reported only for x ≥ 5.1, and is closely related to the structure of Hf3Ta2O11. The results, supported by X-ray diffraction and additional synthesis experiments, are contextualized within the existing literature. Via the sol-gel route, metastable Nb−Zr−O compounds and their heavier congeners are accessible that shed light on possible structures of these commercially utilized materials.

Publikation
ChemistryOpen 2019, 8, 447–450
Dr. Dennis Wiedemann
Dr. Dennis Wiedemann
Technischer Berater für Umweltfragen
Chemiker · Kristallograph

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