Synthesis and characterization of non-stoichiometric cobalt nanoferrites for multifunctional applications

We report on the recognition of crystallite size, morphology, and chemical composition-controlled cobalt ferrite nanoparticles (NPs) with adaptable physical properties for multifunctional applications. The stoichiometric and non-stoichiometric cobalt ferrites (CoFe 2 O 4 & Co 1.5 Fe 1.5 O 4 ) sh...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2022-09, Vol.33 (26), p.20642-20655
Main Authors: Ateia, Ebtesam E., AL-Hamzi, Abdulalah, Hussein, B.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemical composition
Chemistry and Materials Science
Cobalt ferrites
Crystallites
Ferric ions
Magnetization
Materials Science
Memory devices
Nanoparticles
Optical and Electronic Materials
Oxidation
Photoelectrons
Physical properties
Stoichiometry
Valence
X ray photoelectron spectroscopy
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Summary:We report on the recognition of crystallite size, morphology, and chemical composition-controlled cobalt ferrite nanoparticles (NPs) with adaptable physical properties for multifunctional applications. The stoichiometric and non-stoichiometric cobalt ferrites (CoFe 2 O 4 & Co 1.5 Fe 1.5 O 4 ) show unique characteristics due to their different redox states and excellent magnetization. The samples have been synthesized using the citrate autocombustion technique. X-ray photoelectron spectroscopy (XPS) is utilized to study the oxidation state of each element and the chemical stoichiometry composition in the samples. The magnetic loop plots show the ferrimagnetic behavior of CoFe 2 O 4 and Co 1.5 Fe 1.5 O 4 NPs that are saturated with large values of magnetization depending on the stoichiometric/non-stoichiometric ratio. The spin states of Co 2+ (3d 7 ), and Co 3+ (3d 6 ) ions in the B sites have been proposed to be in both high spin and low spin states, respectively. On the other hand, Co 2+ (3d 7 ) in the A site is usually found in high spin states. Additionally, Fe 2+ (3d 6 ), Fe 3+ (3d 5 ) in B sites, and Fe 3+ (3d 5 ) in A sites are frequently found in high spin states. The shape of M–H loops for the investigated samples enables their candidature for applications in memory devices and magnetic sensors.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-022-08876-5