Preparation and magnetic characterization of Fe/metal oxide nanocomposite particles by means of hydrogen reduction assisted ultrasonic spray pyrolysis (USP-HR)

Abstract

Preparationa nd magnetic characterization of Fe/metal oxide nanocompositep articles by means of hydrogenr eduction assisted ultrasonic spray pyrolysis (USP-HR) Fe/metal oxide nanocomposite particles werep roducedb y meansofhydrogen reduction assisted ultrasonic spray pyrolysis.Fe/Fe 0.761 Mg 0.239 Oand Fe/MgO nanocomposite particles wereo btained at 600 and 800 8 C, respectively. The thermodynamics of the formationr eactions werei nvestigated.Increasing the reaction temperatureallowed efficient reduction of the precursor to metallic iron that induces the formationo fp ure MgO phase.T he crystallite sizes of the Fe in the composite structures slightly increased,a nd also the crystallite sizes of the oxides decreased with elevating temperature. The nanocomposite particles exhibited spherical morphology and their particle sizes wereslightlydifferent. All of the samples showed ferromagnetic characteristics and the results indicate that the amount of metal and metaloxide phases most affected the saturation magnetizations of the composite particles which werelower than pure iron.

Effects of the particle properties on electrochemical performance of nanocrystalline LiAl0.1Cu0.1Mn1.8O4 cathode materials prepared by ultrasonic spray pyrolysis

“…Ultrasonic spray pyrolysis (USP) is a versatile, single-step particle preparation technique that allows good control of morphology, size, crystallinity and chemical composition. The particle properties can be adjusted by changing the frequency of atomizer, concentration of precursor, reaction temperature, gas flow rate, and residence time in the reaction zone [25][26][27][28][29][30].…”