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Effect of nanoconfinement on the formation, structural transition and magnetic behavior of mesoporous copper ferrite

Journal article
Authors Najmeh Najmoddin
Ali Beitollahi
Mamoun Muhammed
Narges Ansari
Eamonn Devlin
Seyed Majid Mohseni
Hamidreza Rezaie
Dimitris Niarchos
Johan Åkerman
Muhammet S. Toprak
Published in Journal of Alloys and Compounds
Volume 598
Pages 191–197
ISSN 0925-8388
Publication year 2014
Published at
Pages 191–197
Language en
Keywords Nanoconfinement; Ferrites; Porous materials; Magnetically ordered materials; Crystal structure; Nanostructured materials
Subject categories Magnetism, Nano Technology

Abstract

Superparamagnetic, cubic single phase, ordered mesoporous copper ferrite is synthesized through confinement in nanocages of mesoporous silica. The heat generated during the reaction is conserved in the silica template pore channels, which allows the formation of copper ferrite at a relatively low processing temperature. The Jahn–Teller distortion is suppressed due to the effect of nanoconfinement and thus the high temperature phase of cubic copper ferrite is stabilized at room temperature. The particle size obtained from TEM, the crystallite size calculated from XRD and the magnetic domain size estimated from magnetization measurements are all in good agreement, manifesting the significant role of the confinement in the growth and fabrication of crystalline, single magnetic domain, nanoparticles with superparamagnetic behavior at room temperature.

Page Manager: Webmaster|Last update: 9/11/2012
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