Preparation and properties of MgO-Ni(Fe) nanocrystalline composite

0178170 - UFM-A 20033193 RIV SIGLE CZ eng K - Conference Paper (Czech conference)
Schneeweiss, Oldřich - Pizúrová, Naděžda - Jirásková, Yvonna - Žák, Tomáš - Bezdička, Petr - Večerníková, Eva
Preparation and properties of MgO-Ni(Fe) nanocrystalline composite.
International Conference NANO 03. Brno: VUT Brno, FSI, 2003 - (Šandera, P.), s. 186-189. ISBN 80-214-2527-X.
[International Conference NANO /03./. Brno (CZ), 21.10.2003-23.10.2003]
R&D Projects: GA AV ČR KSK1010104; GA ČR GA202/01/0668; GA MŠMT OC 523.20
Institutional research plan: CEZ:AV0Z4032918; CEZ:AV0Z2041904
Keywords : nanocrystals * composite * phase composition
Subject RIV: BM - Solid Matter Physics ; Magnetism

We have prepared MgO-Ni(Fe) nanocrystalline composites by controlled heat treatment of compacted spark synthesized nanocrystalline powders. Besides particle sizes and their chemical compositions, influence of interaction with surrounding atmosphere and adsorbed gases on phase composition and magnetic properties were investigated. Mössbauer spectroscopy, x-ray diffraction and TEM were used for phase analysis. Thermomagnetic curves and DTA/TG measurements were applied for detection of changes in structure and phase composition during heat treatments. The simultaneous gas analysis using mass spectroscopy by heating yielded information on adsorbed and dissolved gases and their reactions with the nanoparticles.
Permanent Link: http://hdl.handle.net/11104/0075059