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Potential non-toxic pink and red ceramic pigments based on CeO2 were  successfully synthesized by selfpropagating room temperaturemethod and  thermally treated at 600, 900 and 1200°C for 15min. The structure,  morphology and optical properties, as well as thermal stability of  Ce1-xErxO2-δ and Ce1-xPrxO2-δ(x = 0.05) were examined. Single-phase  composition of all obtained CeO2 pigments was confirmed using XRPD method  and Raman spectroscopy and it was not dependent on temperature. The  mechanism of structural behaviour was thoroughly examined using Raman and  FTIR spectroscopy. Nanometric dimensions of the crystallites of all pigments  were confirmed using XRPD, TEM and FE-SEM analysis. Colour properties were  dependent on the temperature treatment, and their position in the  chromaticity diagram was studied using UV/VIS spectrophotometry. Colour  efficiency measurements were supplemented by colorimetric analysis. It is  proved that all samples are thermally stable in the investigated temperature  range (up to 1200°C), and their potential application as environmentally  friendly pigments of desired colour is confirmed.

The influence of short thermal treatment on structure, morphology and optical properties of Er and Pr doped ceria pigments: Comparative study