Na⁺–La³⁺ co-doped γ-Ce₂S₃ (abbreviated as γ-Na_0.5Ce_{2.5 − x}La_xS₄) pigments with a fixed Na/(Ce_1 − xLa_x) 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-Na_0.5Ce_{2.5 − x}La_xS₄ 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-Na_0.5Ce_{2.5 − x}La_xS₄ was evaluated by TG-DSC and its thermal stability increased from 350 to 480°C.

Na ⁺ –La ³⁺共掺杂 γ-Ce ₂ S ₃（缩写为 γ-Na _0.5 Ce _{2.5 −  x} La _x S ₄）颜料，Na/(Ce _{1 −  x} La _x ) 摩尔比固定为 0.2 ( x  = 0, 0.1, 0.5, 0.9, 1.3, 1.7, 2.1 和 2.5) 采用低温自蔓延燃烧法合成。通过调整La ^{3+掺杂比例，以CS} ₂为硫源，在900℃下硫化2 h，得到一系列不同颜色的γ-Na _0.5 Ce _{2.5 -  x} La _x S _4颜料。^{系统研究了La 3+掺杂量对γ-Ce} ₂ S ₃的合成、晶体结构、颜色性能和温度稳定性的影响。结果表明，在x从0增加到2.5的范围内，颜料表现出单一立方γ-Ce ₂ S _3相。与共沉淀法相比，低温自蔓延燃烧法所得颜料的粒径由620 nm下降至310 nm。此外，随着La ³⁺含量的增加，样品的带隙从2.06 eV逐渐增加到2.90 eV，导致颜色从红色（L*  = 39.42，a*  = 40.35，b*  = 30.28）变为橙红色。 （L*  = 49.15，a*  = 35.51，b*  = 40.64），然后变为橙黄色（L*  = 54.85，a*  = 28.53，b*  = 37.30），最后变为白蓝色（L*  = 66.66 ） ，a*  = − 1.42，b*  = 11.25）。此外，通过TG-DSC对γ-Na _0.5 Ce _{2.5 -  x} La _x S ₄的热稳定性进行了评价，其热稳定性从350℃提高到480℃。