Journal Article

FZJ-2018-01658

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Rietveld structure refinement to optimize the correlation between cation disordering and magnetic features of CoFe$_2$O$_4$ nanoparticles

Shams, F.FZJ* ; Kashefi, M. (Corresponding author) ; Schmitz-Antoniak, C.FZJ*

2018
RSC London

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Please use a persistent id in citations: doi:10.1039/C7NJ04934J

Abstract: The structural properties of cobalt ferrite nanoparticles have significant effects on their magnetic behavior. In the current study, we thoroughly scrutinized and optimized the structural characteristics of CoFe$_2$O$_4$ nanoparticles and the correlation with their magnetic properties as a function of the synthesis parameters using Rietveld structure refinement. Nanoparticles were synthesized using co-precipitation method based on design of experiments and then characterized using X-ray diffraction, vibrating sample magnetometry, transmission electron microscopy, and energy dispersive X-ray spectroscopy analyses.Based on response surface methodology studies, we identified factors that had an effect on the structural and magnetic features. In order to reach maximum magnetization, the cations distribution was optimized, and the pH amount and reaction temperature were identified as the most influential factors.We observed that the initial cation ratio of Co$^{2+}$/Fe$^{3+}$ sharply affected the cations distribution, which was subsequently involved in the different structural characteristics and magnetization of nanoparticles. Thiscan be attributed to the hybrid structure formation and magnetic exchange interactions of cations. Finally, the maximum magnetization was achieved at the optimum cations distribution of (Co$_{0.32}$Fe$_{0.68}$)(Co$_{0.70}$Fe$_{1.30}$)O$_4$, where the difference between distributed cobalt cations in tetrahedral and octahedral sites was minimum.

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Contributing Institute(s):

1. Elektronische Eigenschaften (PGI-6)

Research Program(s):

1. 522 - Controlling Spin-Based Phenomena (POF3-522) (POF3-522)

Appears in the scientific report 2018

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Database coverage:
; Allianz-Lizenz / DFG ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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