A series of cerium samarium tungstates Ce_(2–x)Sm_x (WO₄)₃ with $x \le 0.3$ was synthesized by a coprecipitation method followed by thermal treatment at 1000 °C. The polycrystalline compounds were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL) experiments. Using the Rietveld procedure, the decrease in cell parameters showed that a solid solution was obtained. A comparative analysis of diffraction profiles allowed determining structural distortions increasing with increasing composition $x$ . The PL experiments were performed under UV and XR excitations. The variations with composition $x$ of emission intensities observed in the wavelength range of 500–1000 nm, corresponding to complex charge transfers (CTs) and quenching effects, were interpreted in terms of transitions proper to Ce³⁺ and Sm³⁺ cations, accompanied by additional transitions due to oxygen vacancies and other point defects due to substitution and synthesis conditions.

中文翻译：

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化学取代在钨酸钐铈Ce(2-x)Smx(WO4)3 (0≤x≤0.3)光致发光特性中的作用

一系列铈钐钨酸盐 Ce _(2–X)米_X(WO ₄ ) ₃与 $x \le 0.3$ 通过共沉淀法合成，然后在 1000°C 下热处理。通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和光致发光 (PL) 实验对多晶化合物进行了表征。使用 Rietveld 程序，电池参数的降低表明获得了固溶体。衍射剖面的比较分析允许确定随着成分增加而增加的结构畸变 $x$ . PL 实验在 UV 和 XR 激发下进行。组成的变化 $x$ 在 500-1000 nm 波长范围内观察到的发射强度的变化，对应于复杂的电荷转移 (CT) 和猝灭效应，根据适合 Ce ³⁺和 Sm ³⁺阳离子的跃迁进行解释，伴随着由氧引起的额外跃迁由于取代和合成条件引起的空位和其他点缺陷。