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Unit cell generates entire pattern by translation ONLY

Unit cell generates entire pattern by translation ONLY. Unit cell generates entire pattern by translation ONLY. primitive. centered. Unit cells: primitive (1 motif) or centered (2 motifs)/cell. Primitive cell. Asymmetric unit = smallest portion needed to create unit cell. 2 Asym./cells. m.

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Unit cell generates entire pattern by translation ONLY

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  1. Unit cell generates entire pattern by translation ONLY

  2. Unit cell generates entire pattern by translation ONLY

  3. primitive centered Unit cells: primitive (1 motif) or centered (2 motifs)/cell

  4. Primitive cell

  5. Asymmetric unit = smallest portion needed to create unit cell 2 Asym./cells

  6. m m m m One C4 and 2 types of mirrors = 4m

  7. The 14 Bravais Lattices Dr S.J. Heyes, Oxford Univ.

  8. Space group P21/c P = primitive 21 = two-fold screw axis /c = glide (mirror) plane

  9. A -> B by inversion B C D A A -> D by 21 screw axis A -> C by glide plane View another molecule and its packing

  10. Triclinic P 1 Monoclinic P 21/c Space Group examples Orthorhombic P 212121 Tetragonal Face-centered cubic Fm3m Cubic Rhombohedral Hexagonal

  11. Try Escher Websketch!

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