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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/179432
Experimental comparison of the effect of temperature on the vibrational and morphological properties of NixCo3-xO4 nanostructures
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This work presents the experimental comparison of the effect of temperature and nickel addition on the synthesis of NixCo3-xO4 nanostructures x = 0.01, 0.04, 0.1, 0.16, using the sol-gel technique with final heat treatment at 600 °C and 800°C. X-ray diffraction (XRD) analysis indicates the formation of pure Co3O4 at 600 °C and the appearance of an additional residual NiO phase at 800 °C. The presence of this phase evidences a deviation in the peaks of the diffraction angle to lower ones generated by the difference in ionic radii, which is related to the insertion of larger ions (Ni2+) doped in the matrix of Co3O4. Scanning electron microscope (SEM) analysis indicates that there is a densification of the grains at higher temperatures, possibly associated with the thermal effect that generates greater interdiffusion. Fourier-transform infrared spectroscopy (FTIR) spectra show two main absorption bands with vibrations Co2+¬O, Co3+¬O and Ni¬O in 456 cm-1. The effect of doping generates a displacement in the bands that are evident in the Raman analysis, where the vibrational mode A1g at 600 °C is translated 28.07 cm-1. The values of SBET specific surface area indicate that as temperature increases, the surface area and volume of micropores decreases.
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CARDENAS FLECHAS, Leydi julieta, XURIGUERA MARTÍN, María elena, PADILLA SÁNCHEZ, José antonio, CHIMENOS RIBERA, Josep ma., RINCON JOYA, Miryam. Experimental comparison of the effect of temperature on the vibrational and morphological properties of NixCo3-xO4 nanostructures. _Materials Letters_. 2021. Vol. 303, núm. 130477-1-130477-4. [consulta: 13 de gener de 2026]. ISSN: 0167-577X. [Disponible a: https://hdl.handle.net/2445/179432]