Preparation and characterization of the Sr2+-doped γ-Ce2S3@c-SiO2 red pigments exhibiting improved temperature and acid stability.

• The Sr2+-doped γ-Ce 2 S 3 @c-SiO 2 pigment with a Ce3+/Si4+ mole ratio of 0.4 shows excellent acid corrosion resistance. • When the Ce3+/Si4+ mole ratio reaches 0.4, the Sr2+-doped γ-Ce 2 S 3 @c-SiO 2 pigment has better color rendering performance. • The oxidation temperature of Sr2+-doped γ-Ce 2 S 3 was increased from 479 °C to 883 °C upon encapsulation by c-SiO 2 , demonstrating great potential for applications in the ceramic pigment industry. Crystal SiO 2 -coated Sr2+-doped red γ-Ce 2 S 3 (Sr2+-doped γ-Ce 2 S 3 @c-SiO 2) pigments were successfully synthesized via the Stöber method using Sr2+-doped CeO 2 and amorphous SiO 2 (a-SiO 2) sol as the precursors. Further, the effects of the Ce3+/Si4+ mole ratio x, sulfurization temperature, and calcination temperature on the color performance, acid corrosion resistance, and temperature stability of the Sr2+-doped γ-Ce 2 S 3 @c-SiO 2 pigments were systematically investigated. The results reveal that Sr2+-doped γ-Ce 2 S 3 @c-SiO 2 exhibiting improved acid corrosion resistance and color performance (L * = 38.22, a * = 28.97, and b * = 25.49) can be obtained when x = 0.4. The γ-Ce 2 S 3 pigments can be effectively protected from oxidation at high temperatures by applying a transparent crystal SiO 2 (c-SiO 2) coating layer on the pigment surface. The oxidation temperature of the Sr2+-doped γ-Ce 2 S 3 increased from 479 °C to 883 °C by applying c-SiO 2 encapsulation, demonstrating considerable application potential in the ceramic pigment industry. [ABSTRACT FROM AUTHOR]