|
| |
|
|
Preparation and properties of MgO-Ni(Fe) nanocrystalline composite
Schneeweiss, Oldřich ; Pizúrová, Naděžda ; Jirásková, Yvonna ; Žák, Tomáš ; Bezdička, Petr ; Večerníková, Eva
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.
|
|
|
Nanodisperzní oxidy a hydroxidy Mg, Al a Ti
Šubrt, Jan ; Štengl, Václav ; Svobodová, Monika ; Bezdička, Petr ; Kváča, Zdeněk ; Večerníková, Eva ; Bakardjieva, Snejana
Z organických prekursorů a cestou homogenního srážení byly připraveny nanočásticové oxidy a hydroxidy Mg, Al, Ti a Fe. Hydroxidy byly zpracovány metodou sušení nad kritickou teplotou a charakterizovány pomocí elektronové mikroskopie a difrakce, změření specifického povrchu, práškovou rentgenovou difraktometrií a termickou analýzou.
|
|
| |
host ::
RSS.