Abstract
A new class of environmentally benign rare earth pigments of general formula Pr 2− x Ca x Mo 2O 9− δ ( 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 4 f 2→4 f 15 d 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.
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