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Pigmentary Colors from Yellow to Red in Bi2ce2o7 by Rare Earth Ion Substitutions as Possible High NIR Reflecting Pigments

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dc.contributor.author Athira, K V R
dc.contributor.author Rao, P P
dc.contributor.author Sreena, T S
dc.contributor.author Thara, T R A
dc.date.accessioned 2020-02-25T14:41:08Z
dc.date.available 2020-02-25T14:41:08Z
dc.date.issued 2019-01
dc.identifier.citation Dyes and Pigments; 160:177-187 en_US
dc.identifier.uri https://www.sciencedirect.com/science/article/abs/pii/S0143720818312610
dc.description.abstract A new series of high near-infrared (NIR) reflecting pigments with colors ranging from yellow to red by tuning the Bi2Ce2O7 with rare earth ion substitutions on both A and B sites were synthesized by a solid state reaction method. The resulting colorants were evaluated for their structural and optical properties. The absorption edge is gradiently red shifted on substitution from Y to Tb resulting colors yellow to red. The XPS analysis surmises the presence of the elements with trends of reduction in Ce3+ concentration on both substitutions. These results suggest that the color shift is mainly due to charge transfer band shift of the O2− to Ce4+ (4f-5d) and deep red shift is due to the introduction of additional energy level by terbium ions. A brilliant yellow hue was obtained for Bi1.75Y0.25Ce2O7 (b∗ = 51.4), whereas Bi2Ce1.50Tb0.50O7 (a∗ = 15.0) exhibited a red color. High NIR solar reflectance of 93% and 88% were obtained for Bi0.5Y1.5Ce2O7 yellow and Bi2Ce1.50Tb0.50O7 red pigments respectively. The application study of these selected pigments was investigated in the polymer matrix which demonstrates their coloring performance for various potential applications. These results demonstrate the synthesized pigments as potential near infrared reflective candidates for cool roof applications. en_US
dc.language.iso en en_US
dc.publisher ScienceDirect en_US
dc.subject Yellow pigment en_US
dc.subject Red pigment en_US
dc.subject Terbium en_US
dc.subject NIR reflectance en_US
dc.subject Cool colorant en_US
dc.title Pigmentary Colors from Yellow to Red in Bi2ce2o7 by Rare Earth Ion Substitutions as Possible High NIR Reflecting Pigments en_US
dc.type Article en_US

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  • 2019
    Research articles authored by NIIST researchers published in 2019

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