Synthesis, Characterization and Solar-Reflective Properties of Cr2O3-Based Green Pigment

Mantana Suwan; Pantip Sakchaikul; Sorachon Yoriya; Sitthisuntorn Supothina

doi:10.4028/www.scientific.net/AMR.931-932.142

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 931-932Synthesis, Characterization and Solar-Reflective...

Synthesis, Characterization and Solar-Reflective Properties of Cr₂O₃-Based Green Pigment

Abstract:

Solar-reflective green pigment was synthesized from the starting powder consisting of chromium oxide (Cr₂O₃), aluminum oxide (Al₂O₃), titanium dioxide (TiO₂), and vanadium oxide (V₂O₅) by high-speed, wet milling at the speed of 300 rpm for 2 h followed by calcination at 1150 or 1200 °C for 0.5-5 h. X-ray diffraction analysis revealed the presence of reduced chromium oxide, Cr₂O_2.4, which is the major component, and rutile TiO₂ phase of which its XRD peak intensities were intensified upon calcination as a result of phase transformation from amorphous portion in the starting TiO₂. Microstructural analysis revealed significant particle growth after calcination at 1200 °C for 5 h due to Ostwald ripening. Highest near-infrared reflectance of 70.1% was obtained from the product calcined at 1150 °C for 0.5 h. Higher calcination temperature and/or extended period of calcination time led to a reduced reflection which is ascribed to an increased of particle size of the synthesized pigment.

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Advanced Materials Research (Volumes 931-932)

Pages:

142-146

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.931-932.142

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Online since:

May 2014

Authors:

Mantana Suwan, Pantip Sakchaikul, Sorachon Yoriya, Sitthisuntorn Supothina*

Keywords:

Chromium Oxide, Cool Pigment, Green Pigment, Near-Infrared Reflectance, Solar-Reflective Pigment

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