NDLI: Synthesis and Characterization of Co$_{x}$Zn$_{1−x}$AlFeO$

Content Provider	Springer Nature Link
Author	Amir, Md. Baykal, A. Güner, S. Sertkol, M. Sözeri, H. Toprak, M.
Copyright Year	2014
Abstract	Nanocrystalline powders of cobalt and aluminum co-substituted zinc ferrites with general formula Co$_{x}$Zn$_{1−x}$AlFeO$_{4}$ (x = 0.0–1.0) have been synthesized for the first time. Using the citrate-microwave technique and the citric acid as combustion–complexion agent (fuel), materials with spinel mono-phase cubic spinel structure were successfully prepared. The characterization of products was done by XRD, SEM and VSM. The crystallite size estimated by Scherrer formula has been found in the range of 7.7–9.6 nm. The magnetic properties were studied by room temperature (RT) VSM magnetization measurements. The small remanent magnetization (M$_{r}$) and coercivity (H$_{c}$) values reveal the superparamagnetic nature of nanoparticles (NPs) at RT. The extrapolated saturation magnetization (M$_{s}$) is maximum for Co$_{0.8}$Zn$_{0.2}$AlFeO$_{4}$ (17.15 emu/g) and minimum for ZnAlFeO$_{4}$ particles (4.22 emu/g). This case is attributed to high or low amount of cation distribution change from normal to mixed spinel structure. The average magnetic diameters (D $_{ mag) }$ were calculated from magnetic fit studies of M–H spectra. D $_{ mag }$ values are between 8.17 and 8.46 nm and this range is in great accordance with the obtained diameters from XRD measurements. The small M$_{r}$/M$_{s}$ ratios (maximum, 0.219) specify the uniaxial anisotropy according to Stoner–Wohlfarth model for Co$_{x}$Zn$_{1−x}$AlFeO$_{4}$ NPs. RT effective anisotropy constants (K $_{ eff }$) were calculated by using M$_{s}$ and H$_{c}$ values. K $_{ eff }$ constants increased with increasing Co content in the spinel NPs.
Starting Page	747
Ending Page	754
Page Count	8
File Format	PDF
ISSN	15741443
Journal	Journal of Inorganic and Organometallic Polymers and Materials
Volume Number	25
Issue Number	4
e-ISSN	15741451
Language	English
Publisher	Springer US
Publisher Date	2014-12-24
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Magnetic nanomaterials Spinel compounds Saturation magnetisation Mixed ferrite Inorganic Chemistry Organic Chemistry Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Polymers and Plastics

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