Publicado

2019-10-01

Effects of strain on La0.67-x Prx Ca0.33 MnO3, LaMn1-x Cox O3 and LaMn1-x Nix O3 magnetite samples

Efectos de las tensiones en muestras de magnetitas de La0.67-x Prx Ca0.33 MnO3, LaMn1-x Cox O3 and LaMn1-x Nix O3

Palabras clave:

Magnetite, strain strength, Curie temperature, transition temperature (en)
Manganitas, esfuerzos de tensión, esfuerzos de compresión, temperatura de Curie, temperatura de transición (es)

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This paper presents the results obtained from the synthesis and morphological characterization of different magnetite samples:  La0.67-x Prx Ca0.33 MnO3.LaMn1-x Cox O3 and LaMn1-x Nix O3 at 0.13 ≤ 𝑥𝑥 ≤ 0.67 produced by a solid-state reaction mechanism and 𝐿𝐿𝐿𝐿𝑀𝑀𝑀𝑀1−𝑥𝑥(𝐶𝐶𝐶𝐶/𝑁𝑁𝑁𝑁)𝑥𝑥𝑂𝑂3 at 0.0 ≤ 𝑥𝑥 ≤ 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 𝑃𝑃𝑟𝑟, 𝐶𝐶𝐶𝐶, and 𝑁𝑁𝑁𝑁. Moreover, the transition temperatures of metal-insulator and ferromagnetic-paramagnetic phases also largely depend on these strength effects, e.g., at higher concentrations of 𝑃𝑃𝑟𝑟, 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 𝑁𝑁𝑁𝑁 and 𝐶𝐶𝐶𝐶, relocating the shifts of ferromagnetic-paramagnetic and metal-insulator transitions to higher temperatures.

Se reporta la síntesis y la caracterización de manganitas de La0.67-x Prx Ca0.33 MnO3.LaMn1-x Cox O3 and LaMn1-x Nix O3, con 0.13 ≤ 𝑥𝑥 ≤ 0.67, obtenidas por reacción de estado sólido, y de 𝐿𝐿𝐿𝐿𝑀𝑀𝑀𝑀1−𝑥𝑥(𝐶𝐶𝐶𝐶/𝑁𝑁𝑁𝑁)𝑥𝑥𝑂𝑂3, con 0.0 ≤ 𝑥𝑥 ≤ 0.5, obtenidas por el método sol-gel. Las manganitas se caracterizaron a través de medidas difracción de rayos X, resistividad eléctrica y susceptibilidad magnética en función de la temperatura. Se concluyó que los esfuerzos de tensión y compresión en la red dependen fuertemente del contenido de 𝑃𝑃𝑃𝑃, 𝐶𝐶𝐶𝐶 y 𝑁𝑁𝑁𝑁 en las muestras, y que las temperaturas de transición de las fases metal-aislante y ferromagnética-paramagnética depende fuertemente dichos esfuerzos: a mayor contenido de 𝑃𝑃𝑃𝑃 se produjo mayores esfuerzos de tensión que desplazaron el corrimiento de la transición ferromagnética-paramagnética a temperaturas más bajas, mientras que a mayor contenido de 𝑁𝑁𝑁𝑁 y 𝐶𝐶𝐶𝐶 se produjo mayores esfuerzos de comprensión que desplazaron el corrimiento de las transiciones metal-aislante y ferromagnética-paramagnética a temperaturas más altas

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