Controllable magnetic properties of cobalt ferrite particles derived from layered double hydroxide precursors--颗粒学报PARTICUOLOGY

Qi, Y., Yang, Y., Zhao, X., Liu, X., Wu, P., Zhang, F., & Xu, S. (2010). Controllable magnetic properties of cobalt ferrite particles derived from layered double hydroxide precursors. Particuology, 8(3), 207-211. https://doi.org/10.1016/j.partic.2010.03.008

Controllable magnetic properties of cobalt ferrite particles derived from layered double hydroxide precursors

Yonglian Qi ^a, Yingsheng Yang ^a, Xiaofei Zhao ^a, Xilan Liu ^a, Peng Wu ^b, Fazhi Zhang ^a, Sailong Xu ^a *

a State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
b Department of Chemical and Materials Engineering, University of Kentucky, KY 40506-0503, USA

10.1016/j.partic.2010.03.008

Volume 8, Issue 3, June 2010, Pages 207-211

Received 6 June 2009, Accepted 23 September 2009, Available online 30 March 2010.

E-mail: xusl@buct.cn

Highlights

Abstract

Cobalt ferrite Co_xNi_1−xFe₂O₄ (x = 0, 0.5, 1) particles with controllable magnetic properties have been prepared by calcination of co-substituted NiFe²⁺Fe³⁺-layered double hydroxide (NiFe²⁺Fe³⁺-LDH) precursors prepared via a scalable method involving separate nucleation and aging steps (SNAS). Their structural and magnetic characteristics were investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometry (VSM). Measurements of magnetic properties show that the saturation magnetization (M_s) and coercivity (H_c) of the calcined products increased with increasing cobalt content. The LDH precursor-based product obtained by calcination of a mixture of CoFe²⁺Fe³⁺-LDH and NiFe²⁺Fe³⁺-LDH powders with a Co/Ni molar ratio of 1:1, exhibits a moderate value of M_s and an increased value of Hc compared to the corresponding values for an Ni_0.5Co_0.5Fe₂O₄ material prepared by calcination of a Co_0.5Ni_0.5Fe²⁺Fe³⁺-LDH precursor, and a physical mixture of CoFe₂O₄ and NiFe₂O₄ with a Co/Ni molar ratio of 1:1. These results may provide a way to regulate magnetic anisotropy of ferrite spinels by varying the composition of the LDH precursors.

Graphical abstract

Keywords

Layered double hydroxide precursor; Cobalt ferrite; Separate nucleation and aging steps; Magnetic properties

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