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Preparation of Novel Scorzalite Imitated Phosphate Pigments
Hiroaki Onoda and Ryota Sasaki
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DOI:10.17265/2161-6213/2021.4-6.001
Department of Informatics and Environmental Sciences, Kyoto Prefectural University, 1-5, Shimogamo Nakaragi-cyo, Sakyo-ku, Kyoto 606-8522, Japan
Novel phosphate pigments imitated with Scorzalite, FeAl2(PO4)2(OH)2, were prepared from iron and aluminum nitrate solutions, ascorbic acid, and phosphoric acid with pH adjustments (pH 5, 7, 9). The obtained precipitates were heated at 300, 500, and 700 °C for 1 h. The precipitates and their thermal products were estimated with X-ray diffraction (XRD), Infrared (IR) spectra, ultraviolet-visible (UV-Vis) reflectance spectra, and L*a*b* color space. The precipitated sample was not clearly colored, but it turned orange to red when heated. Samples prepared at low pH showed higher whiteness than samples prepared at high pH. The theoretical amount of ascorbic acid was sufficient to completely reduce iron during the adjustment. This study showed the possibility of novel inorganic phosphate red pigment.
Iron aluminum phosphate, natural ore, red pigment.
Journal of Materials Science and Engineering A 11 (4-6) (2021) 35-39
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