









Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Community
Ask the community for help and clear up your study doubts
Discover the best universities in your country according to Docsity users
Free resources
Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors
This presentation is part of Solid State Physics course requirement at Guru Jambheshwar University of Science and Technology. It includes: Structure, Body, Centered, Weigner, Seitz, Cell, Unit, Cell, Cubic, Packing, Factor, Translational, Lattice
Typology: Slides
1 / 16
This page cannot be seen from the preview
Don't miss anything!
we have one atom completely inside the cube plus eight atoms (at each corner) where only one eighth is inside the cube. 1 + (1/8 * 8) = 2 atoms per unit cell We can also calculate the size of the unit cell based of the radius of the atoms in the cell. In the body-centered cubic the atoms along the diagonal (crossing the center of the cube) are touching.Therefore if each atom has a radius of 'r' then the diagonal of the cubic is 4r.
Usually, the length of the cell edge is represented by a. The direction from a corner of a cube to the farthest corner is called body diagonal ( bd ). The face diagonal ( fd ) is a line drawn from one vertex to the opposite corner of the same face. If the edge is a , then we have:
fd^2 = a^2 + a^2 = 2 a^2
bd^2 = fd^2 + a^2
= a^2 + a^2 + a^2 bd^2 = 3 a^2
Construction Of Wigner Seitz Cell
Characteristics of Wigner Seitz Cell
Wigner-Seitz cells associated with all lattice points are identical in size, shape and orientation as follows with the translational symmetry of the lattice.
When stacked the Wigner-Seitz cells fill all space.
The Wigner-Seitz cell is a polyhedron.
The Wigner-Seitz cell has the full point symmetry of its lattice point.
The co-ordination number of Bcc is “8”.