Hydrothermally synthesized Fe3O4 microparticles: Structural, magnetic, Mössbauer and magneto-hyperthermia properties

IF 2.5 Q2 CHEMISTRY, MULTIDISCIPLINARY

Results in Chemistry Pub Date : 2025-01-23 DOI:10.1016/j.rechem.2025.102066

Gopal Niraula , Jose A.H. Coaquira , Edgar Obed Pérez Reyes , Yasir Javed , Edilso Reguera , Joel Garcia , Surender Kumar Sharma

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Abstract

We present hydrothermally prepared Fe₃O₄ microparticles with diverse morphologies such as long micro-rods (LMRs), short micro-rods (SMRs), and micro-disks (MDs) through thermal-reduction of α-Fe₂O₃as support during the crystallization processes. The impact of PO₄³⁻ anions was systematically explored with significant influence on tuning the prepared materials' sizes/shapes and phase composition/stoichiometry. A lower concentration of PO₄³⁻ anions promotes the growth of a mixed iron-oxide phase, for instance, LMRs/SMRs; whereas a higher one results in a pure single-phase cubic Fe₃O₄structure (MDs) The line shape of the Fe2p region using the multiplets splitting model suggests that Fe₃O₄ is mainly present at the surface as validated through Mossbauer spectroscopy. Magnetization measurements revealed an alteration of the Verwey transition from LMRs/SMRs to MDs. Further, these microstructures were examined for their efficiencies in adjusting the hyperthermia response, with specific absorption rates peaking from 2.8 to 3.4 W/g and are noticeably dominated by the shape anisotropy.

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