共沉淀纳米YSZ晶体结构演变的全谱拟合分析（英文）

Rietveld Study on Evolution of Crystalline Structure of YSZ Nanoparticles during Co-Precipitation Synthesis

采用X射线结合全谱拟合,对共沉淀纳米YSZ制备过程中的晶体结构演变进行了分析。结果表明,四方纳米YSZ的含量与锻烧温度有关;在低锻烧温度下生成的四方纳米YSZ具有错乱的晶格,其晶格参数随锻烧温度的升高而变化,经1200℃锻烧后恢复;四方纳米YSZ的晶粒尺寸随锻烧温度的升高先减小后增大。同时探讨了晶格参数变化的原因并计算了四方纳米YSZ晶粒生长的激活能。

The evolution of crystalline structure of YSZ nanoparticles during co-precipitation synthesis was studied by X-ray diffraction via Rietveld refinement.Results show that the transformation of hydroxides to tetragonal nanoparticles is dependent on the calcination temperature.The tetragonal nanoparticles transformed at low calcination temperature have a distortion lattice;the lattice parameters vary with the increase of calcination temperature and are recovered when calcinated at temperature of 1200 ℃.The grain size of tetragonal nanoparticles slightly decreases first and then increases with increasing of calcination temperature.The reasons that caused the distortion of lattice were discussed and the activation energy of grain growth was calculated.