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Updated: Jun 29, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Ni/Zn ratio and La substitution effect on selected structural and magnetic properties of NiZn ferrites
Martin Šoka1, Mariana Ušáková1, Rastislav Dosoudil1
1Institute of Electrical Engineering, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology in Bratislava, 841 04 Bratislava, Slovakia.
Abstract:
Auto-combustion process was used for synthetization of Ni1-xZnxFe2O4and Ni1-xZnxLa0.02Fe1.98O4(x= 0, 0.3, 0.5, 0.64 and 0.7) ferrite samples to investigate their structural and selected magnetic properties. Standard characterization method such as x-ray diffraction, magnetic susceptibility temperature dependencies measurement, low-frequency hysteresis loops recording and complex permeability spectra were used on the research samples. The monophasic ferrite compounds have been prepared. For all samples, with an increase of zinc ions in the content, a decrease of the Curie temperature and coercive field value and an increase of the complex permeability real part value were observed, together with a shift of the ferrimagnetic resonance frequency value to lower ones. Substituted samples showed some differences, such as slightly higher values of the Curie temperature and coercive field, and at the same time slightly lower values of the complex permeability real part and higher values of the ferrimagnetic resonance frequency.
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