caa a22 4500 463189256 CHVBK 20180406164904.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s10973-007-8481-1 doi (NATIONALLICENCE)springer-10.1007/s10973-007-8481-1 Nanoscale spinel ferrites prepared by mechanochemical route [Elektronische Daten] Thermal stability and size dependent magnetic properties [V. Šepelák, P. Heitjans, K. Becker] 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 NiFe2O4 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. Springer Science+Business Media, LLC., 2007 ferrite nationallicence mechanochemistry nationallicence Mössbauer spectroscopy nationallicence nanomaterial nationallicence thermogravimetry nationallicence Šepelák V. Institute of Physical and Theoretical Chemistry, Braunschweig University of Technology, Hans-Sommer-Strasse 10, 38106, Braunschweig, Germany aut Heitjans P. Center for Solid State Chemistry and New Materials, Leibniz University of Hannover, Callinstrasse 3-3A, 30167, Hannover, Germany aut Becker K. Institute of Physical and Theoretical Chemistry, Braunschweig University of Technology, Hans-Sommer-Strasse 10, 38106, Braunschweig, Germany aut Journal of Thermal Analysis and Calorimetry Springer US; http://www.springer-ny.com 90/1(2007-10-01), 93-97 1388-6150 90:1<93 2007 90 10973 https://doi.org/10.1007/s10973-007-8481-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-007-8481-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Šepelák V. Institute of Physical and Theoretical Chemistry, Braunschweig University of Technology, Hans-Sommer-Strasse 10, 38106, Braunschweig, Germany aut NATIONALLICENCE 700 1- Heitjans P. Center for Solid State Chemistry and New Materials, Leibniz University of Hannover, Callinstrasse 3-3A, 30167, Hannover, Germany aut NATIONALLICENCE 700 1- Becker K. Institute of Physical and Theoretical Chemistry, Braunschweig University of Technology, Hans-Sommer-Strasse 10, 38106, Braunschweig, Germany aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Springer US; http://www.springer-ny.com 90/1(2007-10-01), 93-97 1388-6150 90:1<93 2007 90 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer