Abstract
Motivated by the different chromaticity present in the sintered Al2O3 prepared from various same-grade powders, this study examined the probable factor that affects the color by surface chemistry. Only the surface of the sintered Al2O3 changed to a darker ivory color upon ultraviolet (UV) irradiation, which recovered its initial color after a couple of weeks, implying possible surface interaction. Deconvoluting the O 1s XPS peak into the O-1 and O-2 components showed that the amount of surface hydroxyl ions varies according to the powder type and decreases by UV irradiation. In addition, hydroxyl ions adsorbed on the surface of sintered Al2O3 were distinguished by Fourier transform infrared (FT-IR) spectroscopy. Based on the correlation between the XPS O-2 area and the intensity of each FT-IR peak, the hydroxyl ions attached to Al3+ in the tetrahedral interstitial sites most likely affect the color of sintered Al2O3.
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