Details
| Original language | English |
|---|---|
| Pages (from-to) | 349-352 |
| Number of pages | 4 |
| Journal | Reviews on Advanced Materials Science |
| Volume | 18 |
| Issue number | 4 |
| Publication status | Published - Sept 2008 |
Abstract
A single-step synthesis of iron germanate (Fe2GeO4) nanoparticles with an average crystallite size of about 11 nm synthesized via mechanochemical processing of the α-Fe2O3/ Fe/GeO2 mixture at room temperature is reported. Due to the ability of 57Fe Mössbauer spectroscopy to discriminate between probe nuclei on inequivalent crystallographic sites provided by the spinel structure, valuable insight into the local cation disorder in mechanosynthesized Fe2GeO4 is obtained. In contrast to the bulk Fe2GeO4 with a normal spinel structure (λ = 0), the nanocrystalline mechanosynthesized Fe2GeO4 adopts a partly inverse spinel structure with a nonequilibrium cation distribution (λ = 0.67) and deformed polyhedron geometries. Quantitative microstructural information on the disordered cation arrangement provided by Mössbauer spectroscopy is complemented by XRD and TEM investigations revealing the nanoscale nature of the mechanosynthesized material.
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Reviews on Advanced Materials Science, Vol. 18, No. 4, 09.2008, p. 349-352.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Mechanosynthesis of nanocrystalline iron germanate Fe2 GeO4 with a nonequilibrium cation distribution
AU - Šepelák, V.
AU - Bergmann, I.
AU - Diekmann, A.
AU - Heitjans, P.
AU - Becker, K. D.
PY - 2008/9
Y1 - 2008/9
N2 - A single-step synthesis of iron germanate (Fe2GeO4) nanoparticles with an average crystallite size of about 11 nm synthesized via mechanochemical processing of the α-Fe2O3/ Fe/GeO2 mixture at room temperature is reported. Due to the ability of 57Fe Mössbauer spectroscopy to discriminate between probe nuclei on inequivalent crystallographic sites provided by the spinel structure, valuable insight into the local cation disorder in mechanosynthesized Fe2GeO4 is obtained. In contrast to the bulk Fe2GeO4 with a normal spinel structure (λ = 0), the nanocrystalline mechanosynthesized Fe2GeO4 adopts a partly inverse spinel structure with a nonequilibrium cation distribution (λ = 0.67) and deformed polyhedron geometries. Quantitative microstructural information on the disordered cation arrangement provided by Mössbauer spectroscopy is complemented by XRD and TEM investigations revealing the nanoscale nature of the mechanosynthesized material.
AB - A single-step synthesis of iron germanate (Fe2GeO4) nanoparticles with an average crystallite size of about 11 nm synthesized via mechanochemical processing of the α-Fe2O3/ Fe/GeO2 mixture at room temperature is reported. Due to the ability of 57Fe Mössbauer spectroscopy to discriminate between probe nuclei on inequivalent crystallographic sites provided by the spinel structure, valuable insight into the local cation disorder in mechanosynthesized Fe2GeO4 is obtained. In contrast to the bulk Fe2GeO4 with a normal spinel structure (λ = 0), the nanocrystalline mechanosynthesized Fe2GeO4 adopts a partly inverse spinel structure with a nonequilibrium cation distribution (λ = 0.67) and deformed polyhedron geometries. Quantitative microstructural information on the disordered cation arrangement provided by Mössbauer spectroscopy is complemented by XRD and TEM investigations revealing the nanoscale nature of the mechanosynthesized material.
UR - http://www.scopus.com/inward/record.url?scp=61549115042&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:61549115042
VL - 18
SP - 349
EP - 352
JO - Reviews on Advanced Materials Science
JF - Reviews on Advanced Materials Science
SN - 1606-5131
IS - 4
ER -