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Microstructure and coupling mechanisms in MnBi-FeSiB nanocomposites obtained by spark plasma sintering.
Alexandru-Dinu, A; Locovei, C; Bartha, C; Grigoroscuta, M A; Burdusel, M; Kuncser, A; Palade, P; Schinteie, G; Iacob, N; Lu, W; Batalu, D; Badica, P; Kuncser, V.
Afiliación
  • Alexandru-Dinu A; National Institute of Materials Physics, Street Atomistilor 405A, 077125, Magurele, Romania.
  • Locovei C; Faculty of Physics, University of Bucharest, Street Atomistilor 405, 077125, Magurele, Romania.
  • Bartha C; National Institute of Materials Physics, Street Atomistilor 405A, 077125, Magurele, Romania.
  • Grigoroscuta MA; Faculty of Physics, University of Bucharest, Street Atomistilor 405, 077125, Magurele, Romania.
  • Burdusel M; National Institute of Materials Physics, Street Atomistilor 405A, 077125, Magurele, Romania.
  • Kuncser A; National Institute of Materials Physics, Street Atomistilor 405A, 077125, Magurele, Romania.
  • Palade P; National Institute of Materials Physics, Street Atomistilor 405A, 077125, Magurele, Romania.
  • Schinteie G; National Institute of Materials Physics, Street Atomistilor 405A, 077125, Magurele, Romania.
  • Iacob N; National Institute of Materials Physics, Street Atomistilor 405A, 077125, Magurele, Romania.
  • Lu W; National Institute of Materials Physics, Street Atomistilor 405A, 077125, Magurele, Romania.
  • Batalu D; National Institute of Materials Physics, Street Atomistilor 405A, 077125, Magurele, Romania.
  • Badica P; Shanghai Key Laboratory of D&A for Metal-Functional Materials, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China.
  • Kuncser V; Faculty of Materials Science and Engineering, National University of Science and Technology Politehnica Bucharest, Splaiul Independentei 313, 060042, Bucharest, Romania.
Sci Rep ; 14(1): 17029, 2024 Jul 24.
Article en En | MEDLINE | ID: mdl-39043695
ABSTRACT
Fabrication and extensive characterization of hard-soft nanocomposites composed of hard magnetic low-temperature phase LTP-MnBi and amorphous Fe70Si10B20 soft magnetic phase for bulk magnets are reported. Samples with compositions Mn55Bi45 + x⋅(Fe70Si10B20) (x = 0, 3, 5, 10, 20 wt.%) were prepared by spark plasma sintering of powder mixtures. Characterization has been performed by X-ray diffraction, scanning and transmission electron microscopy, magnetometry and 57Fe MÓ§ssbauer spectroscopy. It was shown that samples contain crystallized and nanometric LTP-MnBi phases with various elemental compositions depending on the degree of Bi clustering. Complex correlations between starting compositions, processes during fabrication, and functional magnetic characteristics were observed. Unexpected special situations of the relation between microstructure and magnetic coupling mechanisms are discovered. Exchange spring effects of different strengths occur, being very sensitive to morpho-structural and compositional features, which in turn are controlled by processing conditions. An in-depth analysis of related microscopic characteristics is provided. Results of this work suggest that fabrication by powder metallurgy routes, such as spark plasma sintering of hard and soft magnetic powder mixtures, of MnBi-based composites with exchange spring phenomena have a high potential in designing and optimization of suitable materials with tunable magnetic properties towards rare-earth-free permanent magnet applications.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2024 Tipo del documento: Article País de afiliación: Rumanía Pais de publicación: Reino Unido
Texto completo
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Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2024 Tipo del documento: Article País de afiliación: Rumanía Pais de publicación: Reino Unido