Young's modulus of single-walled carbon nanotubes (SWCNTs) was calculated by a modern pseudo-potential ab initio method. Using different models for wall thickness, we found that the Young's modulus of an SWCNT varies in a wide range from 0.94 to 5.81 TPa. Here, an SWCNT's wall thickness was obtained by electronic structure calculation. Using the wall thickness, we obtained that the Young's modulus of an SWCNT is 1.06-1.16 TPa, which is in agreement with the experimental result of 1.20-1.25 TPa.
The comparative study in structural properties for the mirror systems, 1 ML Ni/1 ML Co∕Pt(111) and 1 ML Co/1 ML Ni∕Pt(111) surface ordered alloys, reveals a structural phase transition from NixCo1−xPt to NixCo1−xPt3 ordered surface alloy when the annealing temperature is between 750 and 800K. The Curie temperature speeds up to decrease when the surface structure changes from NixCo1−xPt to NixCo1−xPt3. The value of critical exponent β near the Curie point crosses from a two-dimensional-like magnetic phase to a three-dimensional-like one after the phase transition. From the composition dependence of the Curie temperature, one can adjust the Curie temperatures of the surface alloy by controlling the annealing temperature.
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