固體物理學(xué)英文ppt-ssp-2(1)(編輯修改稿)
2024-09-01 19:53 本頁面
【文章內(nèi)容簡(jiǎn)介】 nts in space point lattice + basis Lattice +basis=crystal structure 33221139。 auauaurr ????? ???? integer, 321 ?uuu vectorlattice,321 ?aaa ???Translation vectors ),( 321 aaa ???From the point r Lattice? r r ’ 1a 1a 1a1a1a2a2a2a2a2aThe choice of lattice vectors is not unique. Thus one could equally well take the vectors a and b’ as a lattice vectors. Smallest valume Primitive translation vectors Crystal axes S S S S S S S S S S S S S S S S a S S b S a b ??One lattice point per primitive cell. A cell will fill all space by the repetition of suitable crystal translation operations. A minimum volume cell. b. Primitive Lattice Cell Same for all primitive cells ?si n2121aaaaAc e ll???????Not unique (3D) 1a 1a 1a1a1a2a2a2a2a2aNot unique (2D) ? Not unique. WignerSeitz Primitive cell in 2D (or 3D) * Draw lines to connect a given lattice point to all nearby lattice points. * Draw bisecting lines (or planes
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