The Verwey transition in nanostructured magnetite produced by a combination of chimie douce and spark plasma sintering
作者： T. Gaudisson , G. Vázquez-Victorio , M. Bañobre-López , S. Nowak , J. Rivas
DOI: 10.1063/1.4863164
关键词:
摘要: Magnetite nanoparticles about 10nm sized were synthesized by the polyol method. Zero-field-cooled (ZFC)-FC measurements showed a blocking temperature ∼170K and absence of Verwey transition. They subsequently consolidated spark plasma sintering at 750°C for 15min, leading to high density (92% theoretical density), solid body, with grains in 150nm range. X-ray diffraction patterns exhibited spinel single phase cell parameters corresponding magnetite structure. Magnetic decrease coercivity from 685Oe (54.5kA/m) 118K 90Oe (7.2kA/m) 139K. ZFC 25Oe presented three-fold magnetization increase as increased; small transition between 116 117.5K, followed larger one 117.6 124K. The first can be associated complex crystallographic delocalization Fe2+- Fe3+, while second attributed spin reorientation due magnetocrystalline anisotropy constant (K1) change sign previously observed only crystals. © 2014 AIP Publishing LLC.
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