Abstract The nano VO2 powders were prepared by hydrothermal synthesis. The effects of Gd and Nd element doping on the structure and phase transition temperature of VO2 were studied. The X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM), and Transmission electron microscopy (TEM) results showed that Gd element and Nd element will affect the structure of VO2. Gd3+ and Nd3+ can occupy partial position of V4+ lattice and form solid solution, increasing the lattice parameters of VO2. Both the doped and un-doped VO2 powders exhibit a monoclinic structure at room temperature. Due to the lattice deformation caused by Gd or Nd doping, the aggregation of particles is prevented, and the grain is refined obviously. Differential scanning calorimetry curves showed that both Gd doping and Nd doping can reduce the phase transition temperature of VO2(M). When the Gd doping concentration is 6 at%, the phase transition temperature can be reduced from 71.7°C to 60.3°C, and the infrared transmittance before and after the phase transition also changes significantly, reaching more than 40%. Nd doping is similar, and the phase transition temperature decreased to 55.6°C with the addition of 9 at% Nd.

中文翻译：

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Gd/Nd掺杂纳米VO2粉体的合成、微观结构和相变特性

摘要 采用水热合成法制备了纳米VO2粉体。研究了Gd和Nd元素掺杂对VO2结构和相变温度的影响。X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)结果表明，Gd元素和Nd元素会影响VO2的结构。Gd3+和Nd3+可以占据V4+晶格的部分位置并形成固溶体，增加了VO2的晶格参数。掺杂和未掺杂的 VO2 粉末在室温下均呈现单斜结构。由于Gd或Nd掺杂引起的晶格变形，防止了颗粒的聚集，晶粒明显细化。差示扫描量热曲线表明，Gd掺杂和Nd掺杂都能降低VO2(M)的相变温度。当Gd掺杂浓度为6 at%时，相变温度可以从71.7℃降低到60.3℃，相变前后的红外透射率也有明显变化，达到40%以上。Nd 掺杂相似，相变温度随着 9 at% Nd 的添加降低至 55.6°C。