NOMATEN HYBRID-SEMINAR June 6: The role of structural order on the magnetic properties of spinel high entropy oxides (HEOs)

Date

NOMATEN HYBRID-SEMINAR

online: https://meet.goto.com/NCBJmeetings/nomaten-seminar
In-person: NOMATEN seminar room (102)

Friday, JUNE 6th  2025 1 PM (CET)

The role of structural order on the magnetic properties of spinel high entropy oxides (HEOs)

Katarzyna Berent, Ph.D. Eng.
AGH University of Krakow, Academic Centre for Materials and Nanotechnology

 

Abstract:

High-entropy oxides (HEOs) have emerged as a novel class of functional materials, composed of more than four different metallic elements, typically in near-equal atomic ratios, which leads to unique combinations of properties arising from high configurational entropy. Spinel-structured HEOs in the form of Mex(Cr, Fe, Mn, Ni)3-xO4 (Me = Co, Al, and 0≤x≤1) were synthesized using the Pechini method. Comprehensive characterization techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray absorption spectroscopy (XAS/XMCD), Mössbauer spectroscopy, and vibrating sample magnetometry (VSM), were used to determine the structural and magnetic properties of the synthesized materials.

The studies reveal that the degree of structural order, particularly the distribution of cations between tetrahedral and octahedral sites, has a significant influence on the magnetic behavior of these materials. These observations underscore the critical role of cationic site occupancy and configurational entropy in determining the magnetic properties of HEOs. The insights gained from this study contribute to the fundamental understanding of structure-property relationships in HEOs, which will enable the design of materials with specific magnetic properties.

 

Bio:

Dr. Katarzyna Berent is an Assistant Professor at the Academic Centre for Materials and Nanotechnology, AGH University of Krakow. She has been the supervisor of the scanning electron microscopy laboratory at ACMiN for 10 years. Her research is focused on applying novel electron and ion microscopy techniques to understand the role of microstructure in developing and applying advanced performance materials. The studies were conducted in collaboration with scientific teams from the University of Granada, Kyoto University, TU Dresden, and other Polish research institutions. K. Berent is the author and co-author of more than 115 scientific publications.

 

 

 

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This project has received funding from the European Union Horizon 2020 research and innovation
programme under grant agreement No 857470 and from European Regional Development Fund
via Foundation for Polish Science International Research Agenda PLUS programme grant
No MAB PLUS/2018/8.
Poland
The project is co-financed from the state budget within the framework of the undertaking of the Minister of Science and Higher Education "Support for the activities of Centers of Excellence established under Horizon 2020".

Grant: 5 143 237,70 EUR
Total value: 29 971 365,00 EUR
Date of signing the funding agreement: December 2023

The purpose of the undertaking is to support entities of the higher education and science system that have received funding from the European Union budget in the competition H2020-WIDESPREAD-2018-2020/WIDESPREAD-01-2018-2019: Teaming Phase 2. in the preparation, implementation and updating of activities, maintenance of material resources necessary for carrying out activities, acquisition and modernization of scientific and research apparatus, maintenance and development of personnel potential necessary for the implementation of activities, and dissemination of the results of scientific activities.