Nickel-Doped Ceria Nanoparticles: The Effect of Annealing on Room Temperature Ferromagnetism

Crystals

Joseph C. Bear²  Paul D. McNaughter³  Paul Southern¹  Paul O𠆛rien³  Charles W. Dunnill² 

[1] UCL Healthcare Biomagnetics Laboratories, Royal Institution of Great Britain, 21 Albemarle Street, London W1S 4BS, UK; E-Mail:;Energy Safety Research Institute (ESRI), College of Engineering, Swansea University, Bay Campus, Fabian Way Swansea SA1 8EN, UK; E-Mail:;School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK; E-Mails:

关键词: ceria;    nickel doping;    ferromagnetism;    catalysis;    nanoparticles;   

DOI  :  10.3390/cryst5030312

来源: mdpi

【 摘 要 】

Nickel-doped cerium dioxide nanoparticles exhibit room temperature ferromagnetism due to high oxygen mobility within the doped CeO₂ lattice. CeO₂ is an excellent doping matrix as it can lose oxygen whilst retaining its structure. This leads to increased oxygen mobility within the fluorite CeO₂ lattice, leading to the formation of Ce³⁺ and Ce⁴⁺ species and hence doped ceria shows a high propensity for numerous catalytic processes. Magnetic ceria are important in several applications from magnetic data storage devices to magnetically recoverable catalysts. We investigate the effect doping nickel into a CeO₂ lattice has on the room temperature ferromagnetism in monodisperse cerium dioxide nanoparticles synthesised by the thermal decomposition of cerium(III) and nickel(II) oleate metal organic precursors before and after annealing. The composition of nanoparticles pre- and post-anneal were analysed using: TEM (transmission electron microscopy), XPS (X-ray photoelectron spectroscopy), EDS (energy-dispersive X-ray spectroscopy) and XRD (X-ray diffraction). Optical and magnetic properties were also studied using UV/Visible spectroscopy and SQUID (superconducting interference device) magnetometry respectively.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.