Abstract
In the present research, a novel low-temperature sol-gel process was developed for the synthesis of the aluminum oxynitride (AlON) phase using aluminum tri-sec-butoxide, acetonitrile, chloroform, and hydrazinium hydroxide. This straightforward process involves the nitridation of the as-synthesized sols under ultra-high purity nitrogen to form the AlON nano-powders. The effect of various parameters such as pH in the range of 8–11, the solvent to alkoxide molar ratio (30–100), and acetonitrile to chloroform molar ratio (20–100%), and heat treatment temperature (900–1500 °C) and time (4–12 h) on the composition of the prepared powders were studied. The characterization of the powders by X-ray diffraction (XRD), fourier-transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM) demonstrated that the pure phase of AlON (nano powder) was obtained in the sample having the pH value of 10, the molar ratio of solvent to alkoxide of 100, the molar ratio of acetonitrile to chloroform of 80%, which annealed at 1500 °C for 8 h at nitrogen atmosphere with the heating rate of 3 °C/min. Finally, transparent AlON ceramic was fabricated by the spark plasma sintering of as-synthesized AlON powder at 1600 °C for 30 min with a density of 3.64 gr/cm3 and about 54% IR in-line transmission.
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