Abstract
The article presents a detailed study and characterization of the oxide layers on the surface of iron particles of various sizes. Ten iron samples with a size range from a few nm to 50 µm were studied in detail using SEM, TEM, XRD, and TGA analysis. The composition of the multiphase oxide layers on the powder surface was investigated. The main components of the oxide layer were FeO, Fe3O4, and Fe2O3. By the obtained data, a model for the calculation of a multiphase oxide layer thickness on the surface of iron particles was proposed. The proposed model was validated and can be used for the characterization and certification of micro– and nanoscale iron particles.
Highlights
Nanotechnology and nanostructured materials have become highly popular at the end of the last century when common engineering materials reach their application limits
An iron phase and three phases of various iron oxides were detected in the n–Fe_01 and n–Fe_02 samples synthesized by chemical precipitation
Some samples were purchased from manufacturers and a series of samples were synthesized from iron oxides and hydroxides by heating in a hydrogen atmosphere
Summary
Nanotechnology and nanostructured materials have become highly popular at the end of the last century when common engineering materials reach their application limits. Nanostructured materials are currently used in almost all innovative products-from coatings and composites to structural and functional elements. One of the most actively developing areas of nanomaterial science is the study of iron group transition metals and two-component systems based on them [8,9,10,11,12]. Increased attention to these objects is usually caused by the peculiarities of magnetic properties. Iron nanoparticles are actively used for the production of catalysts, information storage systems, current sources, solar panels, and other high-tech products [17,18,19,20]
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