Structural and magnetic properties of composite powders prepared by high-energy milling of ZnO and Fe3O4 precursors
Source abstract
Abstract
Aiming at the preparation of Fe-doped zincite exhibiting magnetic order, ZnO and magnetite (Fe3O4) precursor powders were milled in a high-energy planetary ball mill. The process was completed in 24 h, under vacuum, and employing a ball-to-powder weight ratio (BPR) of 30:1. The milled powders were characterized by using X-ray diffraction (XRD), Mössbauer spectroscopy (MS), and vibrating sample magnetometry (VSM). XRD data revealed the presence of a primary wurtzite structure (zincite) alongside a secondary ZnFe2O4 (franklinite) phase. Mössbauer spectra (MS), fitted with two doublets, (attributed to Fe-doped ZnO and to ZnFe2O4, respectively) in correspondence with a paramagnetic behaviour. In contrast with the Mössbauer data, VSM measurements allowed to observe hysteretic behaviour at both low and room temperatures, indicating the occurrence at that temperature range of magnetic ordering. We propose that both sets results are related to the occurrence of polaron-mediated magnetic order arising from the presence (as detected by XRD) of oxygen vacancies in the ZnO lattice. The interplay between defect-induced carriers and localized spins provides a plausible mechanism for the observed room-temperature ferromagnetism.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: ZnO doping and properties · Magnetic Properties and Synthesis of Ferrites · Surface Roughness and Optical Measurements
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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