Ms
Borislava Georgieva
(Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria)Prof.
Kiril Krezhov
(Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria)
Zink ferrite powders are widely studied due to their application in many fields, such as anode materials for lithium-ion batteries, gas sensors, magnetic materials, catalytic materials, and antibacterial materials in water treatment. We present the structural and magnetic properties of nanosized $ ZnFe_{2} $O$ _{4} $ powders synthesized by sonochemistry and discuss their dependence on the synthesis conditions. The XRD spectra of the as-prepared samples reveal the presence of both an amorphous and a crystalline $ ZnFe_{2} $O$ _{4} $ phase. In the spectrum of the sample annealed at 500 $ ^{o}C $, the peaks are considerably narrower and of higher intensity, proving the sample’s higher degree of crystallinity. The room temperature Mössbauer spectra of the as-prepared and annealed $ ZnFe_{2} $O$ _{4} $ samples showed a superparamagnetic doublet spectrum. Both kinds of samples exhibited paramagnetic behavior at room temperature, which is typical of the normal spinel structure. A very narrow hysteresis curve at 4.2 K was recorded, which could be expected for superparamagnetic particles in the ferrimagnetic state at low temperatures.
Acknowledgments: The work was supported by the Bulgarian National Science Fund under contract KP-06-N48/5 "Multifunctional composite structures based on ferrites (including magneto electrics) and carbon materials" and by the Bulgarian National Science Fund under contract KP-06-India-2 “Usage of thin $ ZnFe_{2} $O$ _{4} $ films for various spintronic devices”. This work was also supported by a joint research project between the Bulgarian Academy of Sciences and WBI, Belgium, and by a joint research project between the Bulgarian Academy of Sciences and the Institute of Low Temperature and Structure Research, Polish Academy of Sciences.
Ms
Borislava Georgieva
(Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria)
Dr
Svetoslav Kolev
(Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria, Neofit Rilski South-Western University, 66 Ivan Mihailov Str., 2700 Blagoevgrad, Bulgaria)
Prof.
Kiril Krezhov
(Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria)
Dr
Lan Maria Tran
(Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422 Wroclaw, Poland)
Dr
Michał Babij
(Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-422 Wroclaw, Poland)
Dr
Abdelfattah Mahmoud
(Greenmat, Chemistry Department, University of Liege, 11 allée du 6 août, 4000 Liège, Belgium)
Mr
Raphael Closset
(Greenmat, Chemistry Department, University of Liege, 11 allée du 6 août, 4000 Liège, Belgium)
Prof.
Benedicte Vertruyen
(Greenmat, Chemistry Department, University of Liege, 11 allée du 6 août, 4000 Liège, Belgium)
Dr
Frederic Boschini
(Greenmat, Chemistry Department, University of Liege, 11 allée du 6 août, 4000 Liège, Belgium)
Dr
Murtaza Bohra
(École Centrale School of Engineering (MEC), Mahindra University, Hyderabad 500043, India)
Prof.
Daniela Kovacheva
(Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., bld. 11, 1113 Sofia, Bulgaria)
Mr
Chavdar Ghelev
(Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria)
Dr
Tatyana Koutzarova
(Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria)
