Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 3057-3067 |
| Seitenumfang | 11 |
| Fachzeitschrift | Chemistry of materials |
| Jahrgang | 18 |
| Ausgabenummer | 13 |
| Publikationsstatus | Veröffentlicht - 27 Juni 2006 |
Abstract
A single-step synthesis of magnesium ferrite (MgFe2O 4) nanoparticles with an average crystallite size of about 8.5 nm synthesized via mechanochemical processing of binary oxide precursors at room temperature is reported. The study highlights the nature of the cation disorder and of the spin arrangement in mechanosynthesized MgFe2O4 as well as its response to changes in temperature. An unusual property of the magnetization enhancement in nanoscale mechanosynthesized MgFe2O 4 is reported. Whereas the inner core of a MgFe2O 4 nanoparticle exhibits a partly inverse spinel structure with a Néel type collinear spin alignment, the major features of the ionic and spin configurations in the grain boundary (surface) region are a nonequilibrium cation distribution and a canted spin arrangement. Although the spin-canting effect tends to reduce the magnetic moment, the magnetization enhancement exhibited by mechanosynthesized MgFe2O4 is attributed to the nearly random distribution of magnetic cations in the surface regions of nanoparticles. On heating above 623 K, the mechanosynthesized MgFe 2O4 relaxes to a structural and magnetic state that is similar to the bulk one.
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- Chemie (insg.)
- Chemische Verfahrenstechnik (insg.)
- Werkstoffwissenschaften (insg.)
- Werkstoffchemie
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in: Chemistry of materials, Jahrgang 18, Nr. 13, 27.06.2006, S. 3057-3067.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Nonequilibrium cation distribution, canted spin arrangement, and enhanced magnetization in nanosized MgFe2O4 prepared by a one-step mechanochemical route
AU - Šepelák, Vladimir
AU - Feldhoff, Armin
AU - Heitjans, Paul
AU - Krumeich, Frank
AU - Menzel, Dirk
AU - Litterst, Fred Jochen
AU - Bergmann, Ingo
AU - Becker, Klaus Dieter
PY - 2006/6/27
Y1 - 2006/6/27
N2 - A single-step synthesis of magnesium ferrite (MgFe2O 4) nanoparticles with an average crystallite size of about 8.5 nm synthesized via mechanochemical processing of binary oxide precursors at room temperature is reported. The study highlights the nature of the cation disorder and of the spin arrangement in mechanosynthesized MgFe2O4 as well as its response to changes in temperature. An unusual property of the magnetization enhancement in nanoscale mechanosynthesized MgFe2O 4 is reported. Whereas the inner core of a MgFe2O 4 nanoparticle exhibits a partly inverse spinel structure with a Néel type collinear spin alignment, the major features of the ionic and spin configurations in the grain boundary (surface) region are a nonequilibrium cation distribution and a canted spin arrangement. Although the spin-canting effect tends to reduce the magnetic moment, the magnetization enhancement exhibited by mechanosynthesized MgFe2O4 is attributed to the nearly random distribution of magnetic cations in the surface regions of nanoparticles. On heating above 623 K, the mechanosynthesized MgFe 2O4 relaxes to a structural and magnetic state that is similar to the bulk one.
AB - A single-step synthesis of magnesium ferrite (MgFe2O 4) nanoparticles with an average crystallite size of about 8.5 nm synthesized via mechanochemical processing of binary oxide precursors at room temperature is reported. The study highlights the nature of the cation disorder and of the spin arrangement in mechanosynthesized MgFe2O4 as well as its response to changes in temperature. An unusual property of the magnetization enhancement in nanoscale mechanosynthesized MgFe2O 4 is reported. Whereas the inner core of a MgFe2O 4 nanoparticle exhibits a partly inverse spinel structure with a Néel type collinear spin alignment, the major features of the ionic and spin configurations in the grain boundary (surface) region are a nonequilibrium cation distribution and a canted spin arrangement. Although the spin-canting effect tends to reduce the magnetic moment, the magnetization enhancement exhibited by mechanosynthesized MgFe2O4 is attributed to the nearly random distribution of magnetic cations in the surface regions of nanoparticles. On heating above 623 K, the mechanosynthesized MgFe 2O4 relaxes to a structural and magnetic state that is similar to the bulk one.
UR - http://www.scopus.com/inward/record.url?scp=33746398485&partnerID=8YFLogxK
U2 - 10.1021/cm0514894
DO - 10.1021/cm0514894
M3 - Article
AN - SCOPUS:33746398485
VL - 18
SP - 3057
EP - 3067
JO - Chemistry of materials
JF - Chemistry of materials
SN - 0897-4756
IS - 13
ER -