Sr^(2+)掺杂对γ-Ce_2S_3色料的呈色性能影响

Effect of Sr^(2+) Doping on the Properties of γ-Ce_2S_3 Pigment

以Ce(NO_3)_3·6H_2O、Sr(NO_3)_2、(NH_4)_2CO_3为原料,采用共沉淀法制得(Ce,Sr)CO_3沉淀物并经1000℃保温2 h煅烧后制得锶铈氧化物,锶铈氧化物在900℃采用CS_2硫化150 min制得Sr^(2+)掺杂的γ-Ce_2S_3色料。研究了Sr^(2+)掺杂量对γ-Ce_2S_3的呈色的影响。采用X射线衍射分析(XRD)、色度仪、紫外可见光谱(UV-vis)对硫化产物进行表征分析。研究结果表明:当掺入Sr^(2+)时,纯相γ-Ce_2S_3在900℃便能合成;Sr/Ce摩尔掺杂比为0.05～0.7时,Sr^(2+)能进入了晶格形成固溶体;随着Sr^(2+)掺杂量的增加,γ-Ce_2S_3颜料的禁带宽度从2.02 eV增加2.28 eV,其颜色由红色逐渐过渡到黄色。

Samples of(Ce,Sr)CO3 were prepared via a coprecipitation method that utilizes Ce(NO3)3·6 H2O,Sr(NO3)2,and(NH4)2 CO3 as raw materials.The(Ce,Sr)CO3 precipitates were calcined at 1000℃for 2 h and subsequently subjected to sulfurization in a CS2 atmosphere at 900℃for 150 min to prepare a Sr2+-dopedγ-Ce2S3 pigment.The effects of the Sr2+/Ce3+mole ratio on the synthesis ofγ-Ce2S3 and color performance were systematically studied.The sulfidization products were characterized by X-ray powder diffraction(XRD),Chromometer and Uv-visible diffuse reflection spectrum(UV-vis).The results show that a pureγ-Ce2S3 can be obtained at 900℃with Sr2+dopant.As the Sr2+/Ce3+mole ratio is from 0.05 to 0.7,the Sr2+has entered the lattice and formed a solid solution.As the Sr2+/Ce3+mole ratio increases,the band gap of the samples gradually increases from 2.02 eV to 2.28 eV and the chromaticity of the samples gradually shifted from red to yellow.