1 / 27

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.

brendapatterson
Download Presentation

Unit cell generates entire pattern by translation ONLY

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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!

More Related