Perovskite-type ALnO₃ (A = Ca, Sr, Ba; Ln = Ce, Pr, Tb) oxides as environmentally friendly yellow pigments

Abstract

ALnO₃ (A = Ca, Sr, Ba; Ln = Ce, Pr, Tb) were synthesized as environmentally friendly inorganic yellow pigments by a conventional solid state reaction. SrCeO₃, BaCeO₃, BaPrO₃, SrTbO₃ and BaTbO₃ were obtained in a single phase form. Among them, the color of SrTbO₃ and BaTbO₃ were bright yellow, because of the strong optical absorption in the blue light region. The yellowness values of SrTbO₃ and BaTbO₃ expressed in a color coordinate were comparable to those of praseodymium yellow (ZrSiO₄:Pr) and bismuth vanadate (BiVO₄), respectively. Furthermore, the yellow color of SrTbO₃ is more greenish than that of ZrSiO₄:Pr, and BaTbO₃ showed a purer yellow color as compared with BiVO₄.