固體物理學(xué)英文ppt-ssp-2(1)-資料下載頁(yè)
2025-08-05 19:53本頁(yè)面
【正文】 A Bravais lattice is a lattice in which every lattice point has exactly the same environment. unit cell ≠ Primitive cell unit cell =Primitive cell Crystal Structure 27 UNIT CELL Primitive Conventional amp。 Nonprimitive ? Single lattice point per cell ? Smallest area in 2D, or ?Smallest volume in 3D ? More than one lattice point per cell ? Integral multibles of the area of primitive cell Body centered cubic(bcc) Conventional ≠ Primitive cell Simple cubic(sc) Conventional = Primitive cell ThreeDimensional lattice types conventional cell: more obvious relation with the point symmetry operation Primitive cell conventional cell sometime Primitive cell conventional cell sometime Figure Figure Figure Figure Figure Figure Figure return return return return Three mon Unit Cell in 3D Characteristics of cubic lattices aThe packing fraction is the maximum proportion of the available volume that can be filled with hard spheres. a
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