Details
| Original language | English |
|---|---|
| Pages (from-to) | 93-97 |
| Number of pages | 5 |
| Journal | Journal of Thermal Analysis and Calorimetry |
| Volume | 90 |
| Issue number | 1 |
| Publication status | Published - Oct 2007 |
Abstract
Among the many types of preparation and processing techniques, the nonconventional mechanochemical route has been recognized as a powerful method for the production of novel, high-performance, and low-cost nanomaterials. Because of their small constituent sizes and disordered structural state, nanoscale materials prepared by mechanochemical route are inherently unstable with respect to structural changes at elevated temperatures. Taking into account the considerable relevance of the thermal stability of nanoscale complex oxides to nanoscience and nanotechnology, in the present work, results on the response of mechanochemically prepared MgFe2O4 and NiFe 2O4 to changes in temperature will be presented. Several interesting features are involved in the work, e.g., a relaxation of the mechanically induced cation distribution towards its equilibrium configuration, a disappearance of the superparamagnetism on heating, an increase of both the saturation magnetization and the Néel temperature with increasing particle size, and a core-shell structure of nanoparticles.
Keywords
- Ferrite, Mechanochemistry, Mössbauer spectroscopy, Nanomaterial, Thermogravimetry
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Journal of Thermal Analysis and Calorimetry, Vol. 90, No. 1, 10.2007, p. 93-97.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Nanoscale spinel ferrites prepared by mechanochemical route
T2 - TTTThermal stability and size dependent magnetic properties
AU - Šepelák, V.
AU - Heitjans, P.
AU - Becker, K. D.
N1 - Funding Information: The present work was supported by the Deutsche Forschungs-gemeinschaft. 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.
PY - 2007/10
Y1 - 2007/10
N2 - Among the many types of preparation and processing techniques, the nonconventional mechanochemical route has been recognized as a powerful method for the production of novel, high-performance, and low-cost nanomaterials. Because of their small constituent sizes and disordered structural state, nanoscale materials prepared by mechanochemical route are inherently unstable with respect to structural changes at elevated temperatures. Taking into account the considerable relevance of the thermal stability of nanoscale complex oxides to nanoscience and nanotechnology, in the present work, results on the response of mechanochemically prepared MgFe2O4 and NiFe 2O4 to changes in temperature will be presented. Several interesting features are involved in the work, e.g., a relaxation of the mechanically induced cation distribution towards its equilibrium configuration, a disappearance of the superparamagnetism on heating, an increase of both the saturation magnetization and the Néel temperature with increasing particle size, and a core-shell structure of nanoparticles.
AB - Among the many types of preparation and processing techniques, the nonconventional mechanochemical route has been recognized as a powerful method for the production of novel, high-performance, and low-cost nanomaterials. Because of their small constituent sizes and disordered structural state, nanoscale materials prepared by mechanochemical route are inherently unstable with respect to structural changes at elevated temperatures. Taking into account the considerable relevance of the thermal stability of nanoscale complex oxides to nanoscience and nanotechnology, in the present work, results on the response of mechanochemically prepared MgFe2O4 and NiFe 2O4 to changes in temperature will be presented. Several interesting features are involved in the work, e.g., a relaxation of the mechanically induced cation distribution towards its equilibrium configuration, a disappearance of the superparamagnetism on heating, an increase of both the saturation magnetization and the Néel temperature with increasing particle size, and a core-shell structure of nanoparticles.
KW - Ferrite
KW - Mechanochemistry
KW - Mössbauer spectroscopy
KW - Nanomaterial
KW - Thermogravimetry
UR - http://www.scopus.com/inward/record.url?scp=34648814401&partnerID=8YFLogxK
U2 - 10.1007/s10973-007-8481-1
DO - 10.1007/s10973-007-8481-1
M3 - Article
AN - SCOPUS:34648814401
VL - 90
SP - 93
EP - 97
JO - Journal of Thermal Analysis and Calorimetry
JF - Journal of Thermal Analysis and Calorimetry
SN - 1388-6150
IS - 1
ER -