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      https://www.ias.ac.in/article/fulltext/jcsc/126/01/0065-0073

    • Keywords

       

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

    • Abstract

       

      New cerium-based ceramic pigments, displaying Ce2Pr0.2Fe$_x$O$_{4.3+y}$ 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.

    • Author Affiliations

       

      Sriparasara Radhika1 Kalarical Janardhanan Sreeram1 Balachandran Unni Nair1

      1. Chemical Laboratory, Central Leather Research Institute, Council of Scientific and Industrial Research, Adyar, Chennai 600 020, India
    • Dates

       
  • Journal of Chemical Sciences | News

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