Effective synthesis route for red-brown pigments based on Ce - Pr - Fe - O and their potential application for near infrared reflective surface coating

Journal of Chemical Sciences

Balachandran Unni Nair¹  Sriparasara Radhika¹  Kalarical Janardhanan Sreeram1¹ 

[1] Chemical Laboratory, Central Leather Research Institute, Council of Scientific and Industrial Research, Adyar, Chennai 600 020, India$$

关键词: Sol-gel route;    calcination;    rare earth pigments;    benign colorants;    red hue;    bandgap energy;    spectroscopy;    NIR reflectance;    cool colorants;    magnetic coating.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

New cerium-based ceramic pigments, displaying Ce2Pr0.2FexO4.3+y stoichiometry, were obtained at low temperature using a sol-gel method. The powder precursor dissolved in 80% ethylene glycol was precipitated using ammonia and the obtained gel calcined at 800°C for 2 h to yield homogeneous and crystalline particles with a diameter of around 150 nm. The oxide was composed of cerium in its +4 oxidation state and Pr in its +3 oxidation state. The oxides with varying Fe content had an intense red-brown colour, with bandgap energy of around 2.2 eV at 0.1 mol% Fe doping. The near infra red reflectance from these pigments, a measure of their ability to reflect rather than absorb heat waves from sunlight was found to be 82.7%, even in the absence of a white reflective base. Such high near infra red reflectance from these pigments qualify them for being ideal cool pigments for surface coating applications.

【 授权许可】

Unknown