Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
Spinel ferrites gained much attention during the last decade as visible light active photocatalysts and photoelectrocatalysts [1,2]. Properties such as narrow band gap energies (≈ 2 eV), high stability, abundance, and low cost make ferrites promising for solar energy production and solar remediation. Zinc ferrite (ZnFe2O4) is one of the most widely studied compounds belonging to the spinel ferrite family. However, various and even contradictory results regarding the photocatalytic activity of ZnFe2O4 have been reported in the scientific literature [3]. ZnFe2O4 crystallize in a phase-centered cubic spinel structure with Fe3+ and Zn2+ ions occupying tetrahedral or octahedral sites [1]. When the Fe3+ and Zn2+ ions are arranged in octahedral and tetrahedral sites, respectively, the ferrite exhibits a so-called normal spinel structure (T[Zn]O[Fe2]O4). When all the Zn2+ ions at the tetrahedral sites are exchanged by Fe3+ ions from octahedral sites, the compound adopts a so-called inverse spinel structure (T[Fe]O[ZnFe]O4). The degree of inversion, x, defined as the fraction of Zn2+ ions occupying octahedral sites, can consequently adopt values from 0 (normal structure) to 1 (inverse structure) according to T[Zn1-xFex]O[ZnxFe2-x]O4 with 0 ≤ x ≤ 1.
The effect of the degree of inversion on the structural, optical, and dielectric properties of ZnFe2O4 has been investigated. These properties directly affect the photocatalytic and photoelectrocatalytic activity of the material. Thus, the degree of inversion plays a major role and should be determined to achieve a significant characterization of the ZnFe2O4 samples.
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