Abstract
Nanospinel MgAl2O4 powder was obtained by a sol–gel method at low-temperature processing. It was synthesized using aluminum tri-sec-butoxide and magnesium nitrate hexahydrate as precursors, in an acid medium at 80 °C. Heat treatments of the dried gel were performed from 200 to 1000 °C (∆T = 100 °C) and the powders were characterized by SEM, XRD, TG/DTA, FT-IR, and HR-TEM. A mixture of semispherical nanoparticles (<50 nm) of boehmite and unreacted magnesium nitrate was found after the sol–gel reaction. According to HR-TEM and XRD results, a low-crystalline spinel MgAl2O4 started forming at 300 °C, which is a lower temperature than the reported for the same phase in other works. A mechanism of reaction is proposed to explain the formation of spinel at low temperature. At 800 and 900 °C a spinel mono-phase totally crystalline was observed. At 1000 °C, the spinel MgAl2O4 phase is well defined but a second phase, magnesium oxide, was found to be about 6% of the final composition. The crystal sizes were 2.272 ± 0.054, 5.222 ± 0.030, 11.610 ± 0.064, and 25.140 ± 0.20 nm for the material heat treated at 700, 800, 900, and 1000 °C, respectively.
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Acknowledgements
This work was supported by IPN (SIP-20160488 and SIP-20150265). L. Zarazúa-Villalobos also acknowledges CONACYT (Mexican Council for Science and Technology) and COFAA-IPN for the scholarships granted to pursue her Ph.D. studies. The authors acknowledge Center for Nano Sciences and Micro and Nanotechnologies (CNMN) of the Instituto Politécnico Nacional (Mexico) for the HR-TEM analysis.
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Zarazúa-Villalobos, L., Téllez-Jurado, L., Vargas-Becerril, N. et al. Synthesis of magnesium aluminate spinel nanopowder by sol–gel and low-temperature processing. J Sol-Gel Sci Technol 85, 110–120 (2018). https://doi.org/10.1007/s10971-017-4526-5
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DOI: https://doi.org/10.1007/s10971-017-4526-5