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Structure and Properties of Mg-Ni-Fe Based Nanaocomposite Prepared by Spark Synthesis
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SYSNO ASEP 0177623 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Structure and Properties of Mg-Ni-Fe Based Nanaocomposite Prepared by Spark Synthesis Author(s) Schneeweiss, Oldřich (UFM-A) RID, ORCID
Jirásková, Yvonna (UFM-A) RID, ORCID
Žák, Tomáš (UFM-A) RID
Bezdička, Petr (UACH-T) SAI, RID, ORCID
Večerníková, Eva (UACH-T) SAISource Title SMARTON 5 Workshop: Functional Surfaces and Materials. Exploring the Vectorial World. - Nijmegen : Katholieke Universiteit Nijmegen, 2001 Pages s. 48 Number of pages 1 s. Action SMARTON Workshop: Functional Surfaces and Materials. Exploring the Vectorial World /5./ Event date 15.11.2001-18.11.2001 VEvent location Maatsricht Country NL - Netherlands Event type WRD Language eng - English Country NL - Netherlands Keywords nanomaterials ; magnetic properties ; Mössbauer spectroscopy Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GV202/98/K002 GA ČR - Czech Science Foundation (CSF) GA202/01/0668 GA ČR - Czech Science Foundation (CSF) ME 209 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) KSK1010104 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z2041904 - UFM-A Annotation A composite based on 3d metals particles embedded in MgO matrix is a promising material for application in sensors using high magnetoresistance. We prepared Mg-Fe-Ni nanocomposite using spark synthesis of the pure Mg, and permalloy (Ni3Fe) electrodes. The magnetic separation and sedimentation treatments were used for separation of nanocrystalline parts from the as-prepared powders. In the as-prepared powder, a-Fe + g-Ni3Fe, Fe(Ni) in Mg, and FeO phases were determined using the Mössbauer phase analysis. Some of the phases were confirmed by the x-ray diffraction measurements. The TG/DTA results indicate presence nanoparticles of Fe-Ni hydrides and high adsorption capacity of moisture and air gases. Temperature dependence of magnetization shows spin-glass like behaviour of the sample. Transformation of the Fe(Ni) in Mg phase and the hydride phases into a-Fe + g Ni3Fe and simultaneously an increasing in FeO + MgO were observed after annealing in vacuum (10-3 Pa) or in the protective atmosphere (H2). Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2002
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