caa a22 4500 445382023 CHVBK 20180317143020.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10948-010-0958-7 doi (NATIONALLICENCE)springer-10.1007/s10948-010-0958-7 Magnetic Phase Transitions in Cobalt Chromite Nanoparticles [Elektronische Daten] [Chandana Rath, P. Mohanty] Cobalt chromite (CoCr2O4), an insulating normal spinel compound, is a potential multiferroic material. We report that pure, nanosize CoCr2O4 particles are synthesized through a conventional coprecipiation technique by controlling the pH of the precipitation. Both single-crystal and polycrystalline samples develop long-range ferrimagnetic order below the Curie temperature, T c (97K), and a sharp phase transition at T s∼31K, attributed to the onset of long-range spiral magnetic order. However, we observed a transition from paramagnetic to superparamagnetic phase at T c. Further lowering the temperature below T c (97K), the superparamagnetic phase transforms to ferrimagnetic phase at blocking temperature, T b, which is found to be between 50 and 60K. This intermediate superparamagnetic phase in between paramagnetic and long-range ferrimagnetic phases is attributed to a nanosize effect. Springer Science+Business Media, LLC, 2010 Rath Chandana School of Materials Science and Technology Institute of Technology, Banaras Hindu University, 221005, Varanasi, India aut Mohanty P. School of Materials Science and Technology Institute of Technology, Banaras Hindu University, 221005, Varanasi, India aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 629-633 1557-1939 24:1-2<629 2011 24 10948 https://doi.org/10.1007/s10948-010-0958-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-0958-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rath Chandana School of Materials Science and Technology Institute of Technology, Banaras Hindu University, 221005, Varanasi, India aut NATIONALLICENCE 700 1- Mohanty P. School of Materials Science and Technology Institute of Technology, Banaras Hindu University, 221005, Varanasi, India aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 629-633 1557-1939 24:1-2<629 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer