Green precursor-assisted solid-state synthesis of LaFeO3 perovskite: role of tannic acid on structural and magnetic properties

Fernando J. Higuera; Juan A. Jaén

doi:10.48204/j.tecno.v8n2.a10869

Submitted July 22, 2026

Published 2026-07-30

Artículos

Vol. 8 No. 2 (2026): Tecnociencia

Green precursor-assisted solid-state synthesis of LaFeO3 perovskite: role of tannic acid on structural and magnetic properties

Fernando J. Higuera ⁺⁻
Juan A. Jaén ⁺⁻

DOI https://doi.org/10.48204/j.tecno.v8n2.a10869

PDF (Español (España))

References

DOI: 10.48204/j.tecno.v8n2.a10869

Published: 2026-07-30

How to Cite

Higuera , F. J. and Jaén , J. A. (2026) “Green precursor-assisted solid-state synthesis of LaFeO3 perovskite: role of tannic acid on structural and magnetic properties”, Tecnociencia, 8(2), pp. 184–209. doi: 10.48204/j.tecno.v8n2.a10869.

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Abstract

LaFeO₃was synthesized via a low-energy solid-state route using commercial and tannic-acid-derived hematite as Fe precursors under identical processing (8 h milling + calcination at 800°C for 20 h, followed by 5 h post-milling), producing four samples. XRD confirms predominantly orthorhombic LaFeO₃(Pnma) in all cases, with residual hematite; the green-precursor samples show lower conversion and minor residual La₂O₃. Post-milling induces crystallite refinement and increased microstrain in all samples, with the green-precursor material exhibiting smaller crystallites (? 79 nm vs ? 91 nm) and more pronounced microstrain, reflecting its initially heterogeneous reaction pathway. Mössbauer spectroscopy shows a single LaFeO₃sextet, with reduced intensity in the green-precursor samples, consistent with residual non-reacted regions. FTIR and XPS reveal organic-derived species only in these samples, while SEM shows agglomerated micrometric structures of nanosized particles, slightly smaller on average. Room-temperature M–H curves confirm weak ferromagnetic behavior, and ZFC–FC measurements display features associated with minor hematite and strong thermal irreversibility, attributed to uncompensated spins enhanced by milling.

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