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Synthesis of Novel Dark Red Phosphate Pigments in Imitation of Natural Ore



Author(s)

Hiroaki Onoda and Syohei Fujikado

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DOI:10.17265/2161-6221/2019.1-2.001

Department of Informatics and Environmental Sciences, Kyoto Prefectural University, 1-5, Shimogamo Nakaragi-cyo, Sakyo-ku, Kyoto 606-8522, Japan

As novel dark red pigment, sodium manganese phosphate, NaMnPO₄, imitated with Natrophilite, was synthesized by heating at various conditions. The heating temperature and time, volume of water, phosphorus resource were studied in this process. The obtained powders were estimated with X-ray diffraction (XRD), Infrared (IR) spectra, ultraviolet-visible (UV-Vis) reflectance spectra, and L*a*b* color space. Further, similar chemical compositions with NaMnPO₄ were also studied in the same method. The obtained samples had weak peaks of NaMnPO4 in XRD patterns. Sample synthesized in Na/Mn = 1/1 at 700 ºC for 6 hours indicated high redness, a* value.

Dark red pigment, natural ores, phosphate materials.