SYNTHESIS OF NOVEL MANGANESE PHOSPHATE VIOLET PIGMENT

Abstract

: Novel violet pigments were synthesized from manganese oxide and phosphoric acid by heating at several temperatures. The obtained materials were investigated by X-ray diffraction analysis (XRD), infrared spectroscopy, X-ray photoelectron spectroscopy, ultraviolet–visible reflectance spectroscopy, and L*a*b* color space. Samples synthesized in this study did not show the XRD peak pattern for certain compounds. At P/Mn = 2/3 and 1/1, samples heated at 500 °C showed high a* value and low b* value, corresponding to violet color. On the other hand, at P/Mn = 2/1, the sample heated at 400 °C had the most violet powder.