PHYS 5315 covers the following key topics: Crystal Structure: Examination of the geometric arrangement of atoms in solids, including unit cells, lattice types, and symmetry operations. Lattice Vibrations: Study of phonons and their role in the thermal and electrical properties of materials. Thermal Properties: Analysis of heat capacity, thermal expansion, and thermal conductivity in solids. Band Theory of Solids: Introduction to electronic band structures, including the formation of energy bands and their implications for electrical conductivity.