科研之友
微信
新浪微博
Facebook
分享链接
摘要
A metastable phase of Sn has been found to co-exist with beta-Sn in Pb-free SnAg microbumps in 3D integrated circuit technology. Synchrotron microbeam X-ray diffraction, high-resolution TEM imaging and selected-area electron diffraction were used to confirm the metastable phase, which has an orthorhombic lattice, with lattice parameter a = 0.635 nm, b = 0.639 nm, and c = 1.147 nm. Its composition is Sn containing a few percent of Ni. A higher rate of nucleation might have enabled its formation.
- 出版日期2015-6
