Synthesis and optical properties of new highly NIR reflective inorganic pigments RE6Mo2O15 (RE = Tb, Dy, Ho, Er). (May 2017)

• Record Type: Journal Article
• Authors: Schildhammer, Daniel; Fuhrmann, Gerda; Petschnig, Lucas; Schottenberger, Herwig; Huppertz, Hubert
• Is Part Of: Dyes and pigments. Volume 140(2017)
• Page Start: 22
• Page End: 28
• Publication Date: 2017-05
• Subjects: Rare earth molybdenum oxides -- NIR-reflectance -- Inorganic pigments -- Yellow-orange -- Alexandrite effect -- Cool pigments; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2017.01.021
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Novel near-infrared (NIR) reflecting pigments with colors ranging from yellow to orange to dark brown based on the rare earth molybdenum oxides RE 6 Mo2 O15 ( RE = Tb, Dy, Ho, Er) are described. The compounds were prepared by solid state reactions and characterized by XRD analysis and UV–Vis–NIR diffuse reflectance spectroscopy. The compounds RE 6 Mo2 O15 ( RE = Tb-Er) crystallize in a trigonal crystal structure with the cell parameters a = 737.6(2)–745.7(2) pm and c = 932.3(1)–946.4(1) pm. For the pigments Er6 Mo2 O15 and Ho6 Mo2 O15, optical and detailed color analysis revealed illuminant-dependent, color changing behavior (orange/yellow). Different light emitting sources such as classical bulb, LED, fluorescence lamp, and solar light were used for the characterization of these pigments. A brilliant yellow color hue was obtained for Dy6 Mo2 O15, whereas Tb6 Mo2 O15 exhibited a dark brown color. High NIR solar reflectance of 51.1%–98.1% were obtained for Tb6 Mo2 O15 and Ho6 Mo2 O15, respectively (recorded in the range between 700 and 2500 nm by using PTFE as reference).