Synthesis and characterization of environmentally benign calcium-doped Pr2Mo2O9 pigments: Applications in coloring of plastics

✍ Scribed by Giable George; L. Sandhya Kumari; V.S. Vishnu; S. Ananthakumar; M.L.P. Reddy

• Book ID: 104030055
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 479 KB
• Volume: 181
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2007.12.024

✦ Synopsis

A new class of environmentally benign rare earth pigments of general formula Pr 2Àx Ca x Mo 2 O 9Àd (x ranges from 0 to 1.0) displaying colors ranging from green to yellow were synthesized by traditional solid-state route, as alternatives to lead, cadmium and chromium colorants. The products were characterized by X-ray powder diffraction, UV-vis spectroscopy and CIE-L*a*b* 1976 color scales. The coloring mechanism is based on the strong absorptions of the pigments in the blue and red regions due to electronic transitions between 4f 2 -4f 1 5d 1 states of Pr 3+ . The designed pigments consist of non-toxic elements and further found to be thermally and chemically stable. The yellow-green pigments were found to be interesting alternatives to existing toxic pigments for coloration of plastics.