纳米晶材料
微晶
材料科学
位错
变形(气象学)
衍射
晶格常数
复合材料
X射线晶体学
结晶学
冶金
纳米技术
光学
化学
物理
作者
K. Jayasankar,Abhishek Pandey,B.K. Mishra,Siddhartha Das
标识
DOI:10.1016/j.matchemphys.2016.01.005
摘要
Nanocrystalline Y2O3 was synthesized by a modified combustion technique using a mixture of glycine and citric acid as fuel. The microstructural characterization of resultant powder was carried out by means of XRD. A detailed investigation was conducted on the XRD peak broadening of Y2O3 using Williamson-Hall method by assuming three models namely uniform deformation model, uniform stress deformation model, and uniform energy density deformation model. The crystallite size, lattice strain, lattice deformation stress, and lattice deformation energy density of Y2O3 were determined from the plots. The internal stresses and internal strains in the crystallites were estimated according to Griffith model with the help of dislocation density obtained from XRD analysis. The observed lattice contraction of nanocrystalline Y2O3 was ascribed to the surface stress, which was further used for estimating surface strain and surface energy. TEM analysis also included to compare the results.
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