Lecture
This lecture covers the key topics of symmetric tilt grain boundaries, twist grain boundaries, O-lattice, and coincidence site lattice. It explains the concept of grain boundaries as solid-solid interfaces between different crystal elements. The slides illustrate various types of grain boundaries and their dislocation arrangements. The instructor discusses the atomistic view of tilt grain boundaries and the dislocations present in them. The lecture also delves into the energy considerations and limitations of describing grain boundaries.