|
Simple Cubic lattice
(vrml).
4x4x4 (vrml) and 6x6x6 (vrml) cells lattices. |
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Body Centered Cubic (BCC) unit cell
(vrml)
2x2x2 (vrml) and 4x4x4 (vrml) cells lattices. α-Fe, Na, K, β-Ti have this structure. The Wigner-Zeitz cell for the BCC lattice is truncated octahedron (vrml). |
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Face Centered Cubic (FCC) unit cell
(vrml).
2x2x2 (vrml) and 4x4x4 (vrml) lattices. Cu, Au, Ag, Al, Pt, Pd have this structure. The Wigner-Zeitz cell for the FCC lattice is rhombic dodecahedron (vrml). |
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NaCl (KCl, MgO, BaO, CaO, SrO) unit cell
(vrml).
2x2x2 (vrml) and 3x3x3 (vrml) cells. NaCl lattice consists of two FCC sublattices. The Na sublattice is displaced by [1/2,0,0] relative to the Cl sublattice. |
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GaAs (ZnS, InAs, InP, AlAs, CdTe, HgTe)
unit cell (vrml).
2x2x2 (vrml) and 3x3x3 (vrml) cells. GaAs lattice consists of two FCC sublattices displaced by [1/4,1/4,1/4] |
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Si (Ge, diamond) unit cell
(vrml).
2x2x2 (vrml) and 3x3x3 (vrml). Diamond lattice is similar to the GaAs one but is made of atoms of one kind. |
![]() | SrTiO3 (CaTiO3) unit cell (vrml). 2x2x2 lattice (vrml). |
![]() | YBa2Cu3O7 (vrml) is a high temperature superconductive crystal (Tc = 93oK). 2x2x1 lattice (vrml). |
![]() | Close packed Face Centered Cubic unit cell (vrml). Close packed hexagonal lattice (Mg, α-Co, α-Be) (vrml). In close packed lattices you can put the third plane in two different way. FCC and hexagonal lattices are very similar (vrml) except for FCC includes a close packed plane of the third type. |
![]() | Real crystals have broken (unoccupied) bonds on surface which may lead to surface reconstruction. (100) Si surface (vrml) "before reconstruction". Gray and black balls show two FCC sublattices of Si. 2x1 reconstruction of (100) Si surface (vrml). |
You can see much more examples at:
"Crystal
Structure Tutorials" has a ton of resources on crystal formations that might
be useful (thanks to Donna Kennan)
"Materials
Science. Introduction to Concepts" by Simon Toh and
Teaching and Education in Crystallography.
These old pages use MoleculeViewer Java applet for viewing 3D molecule and crystal models: Bravais lattices with Cubic symmetry, Real Crystal lattices, Close packed lattices, Deffects of crystal lattices. See also Electron diffraction on Si, Semiconductor microstructures and 3D gallery.