Abstract
Low-temperature synthesis of α-Al2O3 powder is still a great challenge. In this study, we report a direct synthesis of α-Al2O3 platelets by the thermal decomposition of aluminum-urea nitrate ([Al(NH2CONH2)6](NO3)3, AUN) complex at low temperature. The thermal decomposition of AUN and subsequent formation of α-Al2O3 platelets are investigated using thermogravimetric and differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results indicate the formation of hexagonal α-Al2O3 single crystal platelets by the thermal decomposition of AUN at 550 °C. The calcination temperature has a significant effect on the morphology of α-Al2O3 platelets. When the calcination temperature increases from 550 to more than 800 °C, the morphology of α-Al2O3 platelets changes from hexagonal to roundish.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (Grant Nos. 21267016), and Program for Inner Mongolia Excellence Specialist.
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Pei, X., Zhou, L., Zhao, S. et al. Low-temperature synthesis of α-Al2O3 single crystal platelets by one-step thermal decomposition of Al-urea complex. J Therm Anal Calorim 148, 8841–8848 (2023). https://doi.org/10.1007/s10973-023-12297-9
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DOI: https://doi.org/10.1007/s10973-023-12297-9