Details
| Original language | English |
|---|---|
| Pages (from-to) | 2487-2490 |
| Number of pages | 4 |
| Journal | SOLID STATE IONICS |
| Volume | 177 |
| Issue number | 26-32 SPEC. ISS. |
| Publication status | Published - 31 Oct 2006 |
Abstract
Nanocrystalline magnesium aluminate (MgAl2O4) powders were prepared by high-energy milling of the bulk material. Due to the ability of nuclear magnetic resonance (NMR) spectroscopy to discriminate between probe nuclei on inequivalent crystallographic sites, valuable insight into the mechanically induced evolution of a local cation disorder in MgAl2O4 can be obtained. It, thus, was revealed for the first time that the mechanical treatment of MgAl2O4 tends to randomize ions over the cation spinel sublattices. Quantitative microstructural information on the nonequilibrium cation distribution provided by 27Al MAS-NMR is complemented by XRD and TEM investigations revealing the nanoscale nature of the milled material. The cation inversion parameter of the nanosized MgAl2O4 is compared with that of the bulk material at non-ambient conditions.
Keywords
- Cation distribution, Mechanochemistry, Nanocrystalline material, NMR, Spinel
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: SOLID STATE IONICS, Vol. 177, No. 26-32 SPEC. ISS., 31.10.2006, p. 2487-2490.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Nonequilibrium cation distribution in nanocrystalline MgAl2O4 spinel studied by 27Al magic-angle spinning NMR
AU - Šepelák, V.
AU - Indris, S.
AU - Bergmann, I.
AU - Feldhoff, A.
AU - Becker, K. D.
AU - Heitjans, P.
N1 - Funding Information: The work was supported by the Deutsche Forschungsgemeinschaft (DFG). One of the authors (V. Šepelák) thanks the DFG for supporting his work at the Center for Solid State Chemistry and New Materials, University of Hannover, within a Mercator Visiting Professorship. Partial support by the Grant Agency of the Ministry of Education of the Slovak Republic and of the Slovak Academy of Sciences (Grant 2/5146/25) and by the Alexander von Humboldt Foundation is gratefully acknowledged. We are grateful to J. Caro for the possibility to use the TEM facility.
PY - 2006/10/31
Y1 - 2006/10/31
N2 - Nanocrystalline magnesium aluminate (MgAl2O4) powders were prepared by high-energy milling of the bulk material. Due to the ability of nuclear magnetic resonance (NMR) spectroscopy to discriminate between probe nuclei on inequivalent crystallographic sites, valuable insight into the mechanically induced evolution of a local cation disorder in MgAl2O4 can be obtained. It, thus, was revealed for the first time that the mechanical treatment of MgAl2O4 tends to randomize ions over the cation spinel sublattices. Quantitative microstructural information on the nonequilibrium cation distribution provided by 27Al MAS-NMR is complemented by XRD and TEM investigations revealing the nanoscale nature of the milled material. The cation inversion parameter of the nanosized MgAl2O4 is compared with that of the bulk material at non-ambient conditions.
AB - Nanocrystalline magnesium aluminate (MgAl2O4) powders were prepared by high-energy milling of the bulk material. Due to the ability of nuclear magnetic resonance (NMR) spectroscopy to discriminate between probe nuclei on inequivalent crystallographic sites, valuable insight into the mechanically induced evolution of a local cation disorder in MgAl2O4 can be obtained. It, thus, was revealed for the first time that the mechanical treatment of MgAl2O4 tends to randomize ions over the cation spinel sublattices. Quantitative microstructural information on the nonequilibrium cation distribution provided by 27Al MAS-NMR is complemented by XRD and TEM investigations revealing the nanoscale nature of the milled material. The cation inversion parameter of the nanosized MgAl2O4 is compared with that of the bulk material at non-ambient conditions.
KW - Cation distribution
KW - Mechanochemistry
KW - Nanocrystalline material
KW - NMR
KW - Spinel
UR - http://www.scopus.com/inward/record.url?scp=33750283933&partnerID=8YFLogxK
U2 - 10.1016/j.ssi.2006.04.014
DO - 10.1016/j.ssi.2006.04.014
M3 - Article
AN - SCOPUS:33750283933
VL - 177
SP - 2487
EP - 2490
JO - SOLID STATE IONICS
JF - SOLID STATE IONICS
SN - 0167-2738
IS - 26-32 SPEC. ISS.
ER -