Abstract
Na+–La3+ co-doped γ-Ce2S3 (abbreviated as γ-Na0.5Ce2.5 − xLaxS4) pigments with a fixed Na/(Ce1 − xLax) molar ratio of 0.2 (x = 0, 0.1, 0.5, 0.9, 1.3, 1.7, 2.1 and 2.5) were synthesized by low-temperature self-propagating combustion method. By adjusting the La3+ doping ratio, a series of γ-Na0.5Ce2.5 − xLaxS4 pigments with different colors were obtained by sulfurizing at 900°C for 2 h using CS2 as the sulfur source. The effects of La3+ doping amount on the synthesis of γ-Ce2S3, crystal structure, color performance, and temperature stability were systematically studied. The results show that the pigments exhibited a single cubic γ-Ce2S3 phase throughout the range of x increasing from 0 to 2.5. Compared with the co-precipitation method, the particle size of the pigment obtained by the low-temperature self-propagating combustion method decreased from 620 to 310 nm. Furthermore, as La3+ content increased, the band gap of the sample gradually increased from 2.06 to 2.90 eV, causing the color to change from red (L* = 39.42, a* = 40.35, b* = 30.28) to orange-red (L* = 49.15, a* = 35.51, b* = 40.64), then to orange-yellow (L* = 54.85, a* = 28.53, b* = 37.30), and finally to white-blue (L* = 66.66, a* = − 1.42, b* = 11.25). In addition, the thermal stability of γ-Na0.5Ce2.5 − xLaxS4 was evaluated by TG-DSC and its thermal stability increased from 350 to 480°C.
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Acknowledgments
This work was supported by the Project supported by National Natural Science Foundation of China (51462010), Natural Science Foundation of Jiangxi, China (Nos. 20212BAB203024, 20202BABL204015, 20171ACB20022), and the “JBGS” Foundation of Inner Mongolia Autonomous Region Science and Technology Department (No. 2022JBGS0001).
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BW contributed to conceptualization, methodology, and writing–original draft. YL contributed to supervision, resources, and data curation. FS contributed to writing–review and editing. KL contributed to visualization. YS contributed to investigation. ZW contributed to methodology and investigation. All authors read and approved the manuscript.
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Wu, B., Li, Y., Song, F. et al. Study on synthesis and properties of Na+–La3+ co-doped γ-Ce2S3 pigment by low-temperature self-propagating combustion method. J Coat Technol Res (2024). https://doi.org/10.1007/s11998-023-00904-1
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DOI: https://doi.org/10.1007/s11998-023-00904-1