Details
| Original language | English |
|---|---|
| Pages (from-to) | 1232-1239 |
| Number of pages | 8 |
| Journal | CHEMISTRYSELECT |
| Volume | 4 |
| Issue number | 4 |
| Early online date | 25 Jan 2019 |
| Publication status | Published - 31 Jan 2019 |
Abstract
Spinel ferrites (MFe 2O 4, where M is a metal ion) in general, and zinc ferrite (ZnFe 2O 4, ZFO) in particular, have recently received considerable attention due to promising results in the field of photocatalysis and, especially, photoelectrochemistry. ZFO exhibits a variable crystal structure in which the distribution of the cations between octahedral and tetrahedral sites in the cubic close-packed oxygen lattice, i. e., the degree of inversion, is known to depend closely on the synthetic conditions. Although the effect on the magnetic and optical properties is well known, fundamental research is still missing to fully understand the impact of the cation distribution on the photoelectrochemical activity. In this context, an utmost important physicochemical property is the electrical conductivity. In this work, the dielectric properties of ZFO samples with degrees of inversion ranging from 0.07 to 0.20 were investigated. The conductivity of the ZFO samples was found to increase as the degree of inversion increases. At an onset value of the degree of inversion between 0.13 and 0.16, the bulk conductivity increases by two orders of magnitude. This increase is a direct evidence of the high impact of the cation arrangement in the crystal lattice on the electronic properties of ZFO.
Keywords
- Cations, Degree of inversion, Semiconductors, Spinel phases, Zinc ferrite
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
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In: CHEMISTRYSELECT, Vol. 4, No. 4, 31.01.2019, p. 1232-1239.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Effect of the Degree of Inversion on the Electrical Conductivity of Spinel ZnFe2O4
AU - Granone, Luis Ignacio
AU - Dillert, Ralf
AU - Heitjans, Paul
AU - Bahnemann, Detlef
N1 - Financial support from the Deutsche Forschungsgemeinschaft under the program SPP 1613 (BA 1137/22-1) and the Niedersächsisches Ministerium für Wissenschaft und Kultur (MWK) (NTH-research group “ElektroBak”) is gratefully acknowledged. P.H. is grateful to the MWK for a Niedersachsen Professorship.
PY - 2019/1/31
Y1 - 2019/1/31
N2 - Spinel ferrites (MFe 2O 4, where M is a metal ion) in general, and zinc ferrite (ZnFe 2O 4, ZFO) in particular, have recently received considerable attention due to promising results in the field of photocatalysis and, especially, photoelectrochemistry. ZFO exhibits a variable crystal structure in which the distribution of the cations between octahedral and tetrahedral sites in the cubic close-packed oxygen lattice, i. e., the degree of inversion, is known to depend closely on the synthetic conditions. Although the effect on the magnetic and optical properties is well known, fundamental research is still missing to fully understand the impact of the cation distribution on the photoelectrochemical activity. In this context, an utmost important physicochemical property is the electrical conductivity. In this work, the dielectric properties of ZFO samples with degrees of inversion ranging from 0.07 to 0.20 were investigated. The conductivity of the ZFO samples was found to increase as the degree of inversion increases. At an onset value of the degree of inversion between 0.13 and 0.16, the bulk conductivity increases by two orders of magnitude. This increase is a direct evidence of the high impact of the cation arrangement in the crystal lattice on the electronic properties of ZFO.
AB - Spinel ferrites (MFe 2O 4, where M is a metal ion) in general, and zinc ferrite (ZnFe 2O 4, ZFO) in particular, have recently received considerable attention due to promising results in the field of photocatalysis and, especially, photoelectrochemistry. ZFO exhibits a variable crystal structure in which the distribution of the cations between octahedral and tetrahedral sites in the cubic close-packed oxygen lattice, i. e., the degree of inversion, is known to depend closely on the synthetic conditions. Although the effect on the magnetic and optical properties is well known, fundamental research is still missing to fully understand the impact of the cation distribution on the photoelectrochemical activity. In this context, an utmost important physicochemical property is the electrical conductivity. In this work, the dielectric properties of ZFO samples with degrees of inversion ranging from 0.07 to 0.20 were investigated. The conductivity of the ZFO samples was found to increase as the degree of inversion increases. At an onset value of the degree of inversion between 0.13 and 0.16, the bulk conductivity increases by two orders of magnitude. This increase is a direct evidence of the high impact of the cation arrangement in the crystal lattice on the electronic properties of ZFO.
KW - Cations
KW - Degree of inversion
KW - Semiconductors
KW - Spinel phases
KW - Zinc ferrite
UR - http://www.scopus.com/inward/record.url?scp=85060874963&partnerID=8YFLogxK
U2 - 10.1002/slct.201804062
DO - 10.1002/slct.201804062
M3 - Article
VL - 4
SP - 1232
EP - 1239
JO - CHEMISTRYSELECT
JF - CHEMISTRYSELECT
SN - 2365-6549
IS - 4
ER -