SrY2−xCexO4 solid solutions were synthesized as environmentally-friendly inorganic pigments and the color gradually changed from yellow to reddish brown on increasing the Ce3+ concentration.
Ba(Zn1−xCox)2Si2O7 (0 ≤ x ≤ 0.50) solid solutions were synthesized as blue-violet inorganic pigments and the colour gradually changed from pale blue-violet to deep blue-violet with increasing the Co2+ concentration.
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