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Title: Unraveling the Role of Lattice Substitutions on the Stabilization of the Intrinsically Unstable Pb2Sb2O7 Pyrochlore: Explaining the Lightfastness of Lead Pyroantimonate Artists’ Pigments
Authors: Marchetti, Andrea
Saniz, Rolando
Krishnan, Dileep
Rabbachin, Laura
Nuyts, Gert
De Meyer, Steven
Verbeeck, Johan
Janssens, Koen
Pelosi, Claudia 
Lamoen, Dirk
Partoens, Bart
De Wael, Karolien
Issue Date: 2020
The pyroantimonate pigments Naples yellow and lead tin antimonate yellow are recognized as some of the most stable synthetic yellow pigments in the history of art. However, this exceptional lightfastness is in contrast with experimental evidence suggesting that this class of mixed oxides is of semiconducting nature. In this study the electronic structure and light-induced behavior of the lead pyroantimonate pigments were determined by means of a combined multifaceted analytical and computational approach (photoelectrochemical measurements, UV-vis diffuse reflectance spectroscopy, STEM-EDS, STEM-HAADF, and density functional theory calculations). The results demonstrate both the semiconducting nature and the lightfastness of these pigments. Poor optical absorption and minority carrier mobility are the main properties responsible for the observed stability. In addition, novel fundamental insights into the role played by Na atoms in the stabilization of the otherwise intrinsically unstable Pb2Sb2O7 pyrochlore were obtained.
ISSN: 0897-4756
DOI: 10.1021/acs.chemmater.9b04821
Rights: Attribution-NonCommercial-NoDerivs 3.0 United States
Appears in Collections:A1. Articolo in rivista

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