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The effect of annealing atmosphere on the structural properties of FeSiBPCu alloys with different silicon content

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NANOMET-type soft magnetic alloys of Fe82Si4B10P3Cu1 and Fe78Si8B10P3Cu1 were studied. Nanocrystalline alloys were prepared by annealing the amorphous precursors at a temperature of 420 °C for 20 and 60 min in vacuum and in Ar atmosphere. The effect of the annealing atmosphere and time of annealing on the alloy structural and magnetic properties were investigated by X-ray diffraction (XRD), Mössbauer spectroscopy (MS), magnetic measurements and atomic force microscopy (AFM). XRD unveiled partial crystallization of the Fe82Si4B10P3Cu1 alloy and confirmed amorphous structure of the Fe78Si8B10P3Cu1 alloy. The technique also indicated larger grain size after annealing in vacuum as compared to that in argon. MS disclosed the effect of the silicon content on the annealed alloys microstructure, namely the lower relative volumetric fraction of the A8 crystalline phase component for the alloy with 8 at. % Si as compared to the alloy with 4 at. % Si. Variations of the parameters reflecting the magnetic microstructure were also observed and are discussed with relation to different annealing times and atmospheres. Magnetic measurements showed better soft magnetic properties for sample with 8 at. % Si whose coercivity was lower as well as the determined magnetization work. They also indicated lower coercivity for argon annealed samples and showed that longer annealing times are reflected in the increased resultant coercivity. For both studied compositions, the AFM measurements inspecting the morphology of the sample surfaces manifested the presence of lower protrusions on the surfaces of the vacuum annealed samples as compared to the argon annealed ones, where also larger agglomerates were disclosed.

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This work was partially supported by grants of the Slovak Research and Development Agency No. APVV-19–0369 and of the Scientific Grant Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic No. 1/0130/20 and No. 2/0144/21.

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All authors contributed to the study conception and design. All authors read and approved the final manuscript.

Conceptualization: Katarína Sedlačková, Jozef Sitek; Formal analysis and investigation: Katarína Sedlačková, Beata Butvinová, Milan Pavúk, Július Dekan and Patrik Novák; Material preparation: Beata Butvinová, Stanislav Sojak. Writing—original draft preparation: Katarína Sedlačková, Beata Butvinová, Milan Pavúk; Writing—review and editing: all authors; Supervision: Jozef Sitek.

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Correspondence to Katarína Sedlačková.

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This article is part of the Topical Collection on Proceedings of the International Symposium on the Industrial Applications of the Mössbauer Effect (ISIAME2022), Olomouc, Czech Republic

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Sedlačková, K., Butvinová, B., Pavúk, M. et al. The effect of annealing atmosphere on the structural properties of FeSiBPCu alloys with different silicon content. Hyperfine Interact 243, 23 (2022).

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