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
Abstract 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.
| Main Authors: | , , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Universidad Nacional de Colombia
2019
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| Online Access: | http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0012-73532019000400278 |
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| Summary: | Abstract 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. |
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