Add time:08/04/2019         Source:sciencedirect.com

Yellow Bi2O3/BaCO3 complex pigments were prepared by thermolysis of precursors from the precipitation of Bi2O2CO3 on BaCO3 particles at low temperature between 350 and 410 °C. The synthesized powders were analyzed by colorimetry, UV-Vis-NIR spectroscopy, X-ray diffraction, and scanning electron microscopy. The pigments were found to have composite phases consisting of β-Bi2O3 and BaCO3. The addition of BaCO3 substantially reduced the consumption of Bi2O3 and maintained comparable or improved color properties and NIR reflectance compared to pure β-Bi2O3. The complex pigments prepared at a 1:1 composition of Bi2O3/BaCO3 exhibited excellent color performance, with L* = 95.63, b* = 79.85, and h° = 90.48 (closed to ideal yellow color, h° = 90), as well as impressive NIR reflectance of up to 96.51%. Finally, an approximately 7.6 °C decrease in temperature was observed for the inner surface of ceramic tiles coated with the cool pigments relative to blank polyurethane coating.

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