Crystal Structure

Crystal Structure

1. When atoms are arranged in a regular (repetitive pattern)

2. Crystal Structures

   • Simple Cubic (SC)
     • Atoms are at 90°
   • Crystal lattice
   • Space lattice
     • set of points that forms a crystal
     • Primitive (simple)
       • lattie points only at cell corners
         • P
     • base-face cantered
       • lattice points cantered on the C faces or end of cell
         • C
     • all-face cantered
       • lattice points cantered on all faces
         • F
     • innercentered
       • centre of the volume of the unit cell
         • I
     • primitive rhombohedral
       • separate basic arrangement
         • R
     • lattice parameter

3. Crystal Systems

   • Monoclinic
   • Orthorhombic
   • Tetragonal
   • Hexagonal
   • Triclinic
   • Rhombohedral
   • Cubic

4. Bravais Lattice

   • Combination of the systems whit the arrangements

5. Atomic Packing

   • packing factor
     • How well occupied is the space in the unit cell
     • interstitial
       • empty space

6. Closed packed directions

   • in wich direction are the atoms
     • Relation A0 and r
     • points
     • Directions
     • Plane
     • Density
       • Linear Density
       • Planar density

7. Volumetric Density

8. Bragg's Law

   • Measure the distance between parallel planes

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