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Updated: May 23, 2026

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Transition-metal-induced magnetism in particles of CaYAl3O7: Ni, Fe and Co
José Laurentino1,2, Luiza Paffer1,2, José Araújo2,3
1Programa de Pós-Graduação Em Engenharia Física, Universidade Federal Rural de Pernambuco 54518-430 Cabo de Santo Agostinho Pernambuco Brazil joseholanda.silvajunior@ufrpe.br.
Abstract:
Here, we report the first observation of transition-metal-induced magnetism in CaYAl3O7 particles doped with Ni, Fe, and Co ions synthesized by the Pechini method. Structural characterization by X-ray diffraction followed by Rietveld refinement confirmed preservation of the tetragonal melilite phase without detectable secondary phases. Microstructural parameters such as crystallite size, lattice strain, and dislocation density were evaluated, revealing only minor structural distortions after doping. Raman spectroscopy further confirmed the structural integrity of the host lattice while indicating local symmetry perturbations caused by dopant incorporation. Magnetic measurements performed by vibrating sample magnetometry revealed clear hysteresis loops with finite coercivity and remanent magnetization, following the trend Co < Fe < Ni. The observed magnetic behavior is attributed to exchange interactions among localized magnetic moments introduced by the transition-metal ions. These results demonstrate that doped CaYAl3O7 is a promising multifunctional material combining optical and magnetic functionalities for applications in sensing, photonics, and magneto-optic devices.
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