Abstract

OLARTE-TORRES, Javier Alberto; CIFUENTES-ARCILA, María Cristina  and  SUAREZ-MORENO, Harvey Andrés. Effects of strain on Lα _0.67-x Pr _x Cα _0.33 Mn0 ₃ , LαMn _1-X C0 _x 0 ₃ and LαMn _1-x Ni _x 0 ₃ magnetite samples. Dyna rev.fac.nac.minas [online]. 2019, vol.86, n.211, pp.278-287. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v86n211.78081.

This paper presents the results obtained from the synthesis and morphological characterization of different magnetite samples: Lα 0.67-x Pr x Cα 0.33 Mn0 3 at 0.13 ≤ x ≤ 0.67 produced by a solid-state reaction mechanism and LαMn 1-x Ni x 0 3 at 0.0 ≤ x ≤ 0.5 produced by the sol-gel method. These samples were characterized using X-ray diffraction spectroscopy and by measuring electric resistivity and magnetic susceptibility which were carried out as a function of temperature. Notably, the effects of strain and compressive strength on the lattices of magnetite samples were highly dependent on the concentration of Pr, Co and Ni. Moreover, the transition temperatures of metal-insulator and ferromagnetic-paramagnetic phases also largely depend on these strength effects, e.g., at higher concentrations of Pr, effects of increased strain strength were observed, relocating the shifts of ferromagnetic-paramagnetic transitions to lower temperatures. On the other hand, effects of increased compressive strength were observed at higher concentrations of Ni and Co, relocating the shifts of ferromagnetic-paramagnetic and metal-insulator transitions to higher temperatures.

Keywords : magnetite; strain strength; Curie temperature; transition temperature.

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