Abstract
Spray pyrolysis of an aqueous solution of iron nitrate, proceeded with reduction of the product in hydrogen, gave iron powder with micron-sized hollow particles. Coating these iron particles with SiO2 through tetraethyl orthosilicate hydrolysis prevented interparticle electrical contacts and suppressed DC percolation. This material shows a high ferromagnetic resonance frequency of 18 GHz, low permittivity, and weighs 20% less than common carbonyl iron. Potential microwave applications are for inductors and electromagnetic interference shielding designs.
Highlights
The technology of ultrasonic spray pyrolysis has been known since the end of the last century [1].It consists of the drying and thermal decomposition of aerosol drops
This paper reports the preparation of hollow iron microspheres via ultrasonic spray pyrolysis
The first step, spray pyrolysis, resulted in a fine powder of iron oxide, “Fe2 O3 ”. Since this was just an intermediate product and no chemical properties were of interest, X-ray diffraction (XRD) analysis was not applied for the study of the “Fe2 O3 ”
Summary
The technology of ultrasonic spray pyrolysis has been known since the end of the last century [1]. It consists of the drying and thermal decomposition of aerosol drops. Ultrasonic spray pyrolysis allows micron-sized powders of metal oxides [2] and metals [3,4,5] to be produced. An ultrasonic atomizer sputters the initial salt solution that undergoes high temperatures. Both the metal oxides and metals, when an additional reduction stage is implemented, can be produced starting from the metal salt solution. The list of metals that have already been studied is limited and further extension is of interest
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