Size-Dependent Lattice Distortion in 蔚-Ag3Sn Alloy Nanoparticles

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• 作者：Nikolas Oehl ; Martin Knipper ; J眉rgen Parisi ; Thorsten Plaggenborg ; Joanna Kolny-Olesiak
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：June 25, 2015
• 年：2015
• 卷：119
• 期：25
• 页码：14450-14454
• 全文大小：274K
• ISSN：1932-7455

文摘

In this study, the crystallographic structure of orthorhombic 蔚-phase Ag₃Sn nanoparticles with different sizes between 7 and 120 nm was studied by X-ray diffraction, and the influence of the size and the composition of the nanocrystals on the lattice parameters were investigated. Rietveld refinement was used to confirm the orthorhombic (space group Cmcm) crystal structure and to determine the lattice parameters and the size of the crystals for all nanoparticle samples. We found an anisotropic decrease of the lattice parameters which furthermore depends on the size of the crystallites. Etching the nanoparticles with sulfuric acid allows us to control the Ag/Sn ratio of the Ag₃Sn nanoparticle samples. The lattice parameters decrease for higher Ag/Sn ratio.