Ceramics

Dupree, R.

doi:10.1002/9780470034590.emrstm0065

Cited by 1 publication

(1 citation statement)

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“…For the original powder (Figure 7A), there were five peaks centered at 114, 71.3, 65, 14.6, and 11 ppm, respectively. It is commonly accepted that aluminum has a range of local tetrahedral and octahedral environments, including mixed anion (ie, nitrogen and oxygen) coordinations in AlON 26‐28 . Here, the 27 Al MAS NMR spectra of AlON were dominated by a sharp Al‐O resonance at δ = 14.6 ppm corresponding to the structural units of [AlO 6 ], and the shoulder peak at 11 ppm, which is adjacent to [AlO 6 ], should be assigned to [AlO 5 N] 29 .…”

Section: Resultsmentioning

confidence: 92%

Oxidation behavior and mechanism of aluminum oxynitride (AlON) at elevated temperatures

Yang

Chen

et al. 2020

J. Am. Ceram. Soc.

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The oxidation behavior and mechanism of aluminum oxynitride (AlON) powder exposed to air at elevated temperatures between 800°C and 1300°C was investigated by X-ray diffractometry (XRD), scanning electron microscope (SEM), electron spin resonance (ESR), nuclear magnetic resonance (NMR), and simultaneous thermogravimetry, differential thermal analysis, and mass spectrometry techniques (TG-DTA-MS). The weight of AlON gradually increases to a maximum value at 1150°C and then decreases with further heating. Meanwhile, AlON powder undergoes chemical changes, as evidenced by lattice expansion, and turns eventually into alumina. ESR spectra reveal the occurrence of lone pair electrons in the oxidized products and the intensity of corresponding resonance signal increases before disappearing with the increase in temperature. Combined with the results of NMR and TG-DTA-MS, the measured data suggest that Al-N in [AlO 3 N] tetrahedron and [AlO 5 N] octahedron are gradually oxidized into Al-ON group with lone pair electrons, which causes continuous weight gain and lattice expansion. Further oxidation at higher temperatures results in alumina and N 2 .

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Section: Resultsmentioning

confidence: 92%