Unit-Cell Displacements
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Dialog Box - called from: Unit Cell dialog

The unit cell drawn with the Unit Cell dialog (Input2 menu) has its origin at particular coordinates in the structure coordinate system. The displacements from 0,0,0 are in fractions of the current cell vectors, which may be either primitive or Bravais vectors. The current vectors, in terms of components in the axes used for atomic coordinates (normally the Bravais cell edges), are listed; these are trivial unless you have chosen a primitive cell for a non-primitive Bravais lattice. If you have chosen the -0.5 to 0.5 suboption of the Default Unit Cellboundary option, the boundary volume is centered on the origin, so the displacements -0.5, -0.5, -0.5 will cause the unit-cell outline to coincide with the edges of the boundary shape. For the 0 to 1 suboptions use the displacements 0, 0, 0.