MOLECULAR MATERIAL PHYSICAL CHEMISTRY
Learning outcomes of the course unit
The course focuses on the phisical properties and characterization of molecular materials.
Course contents summary
PREPARATION AND CLASSIFICATION OF MATERIALS
Main methods of materials prepatation. Gas, liquids and crystalline solids. Liquid crystals. Incommensurate structures.
Lattice, unit cell, space groups. Group of primitive traslations, andits irreducible representations. Factor group. Reciprocal lattice.Bloch theorem.
SIMMETRY AND PHASE TRANSTIONS
Symmetry breaking. First and second order phase transtions. Landau theory.
VIBRATIONS IN CRYSTALS
Vibrations in a monodimensional lattice, monatomic and biatomic.Periodic boundary conditions and Brillouin zones. Extension totridimensional lattices: dynamic equation. Phonons. Experimentalmethods for the vibratioanl dispersion curves: infrared absorption,Raman scattering, X ray, neutron scattering. Density of states. Bosedistribution and specific heat. Debye model.
ELECTRONIC STATES IN CRYSTALS
Tightbinding method. Free electron and nearly free electron models. Fermisurface. Fermi distribution and electronic specific heat inmetals. Electron-electron interaction in metals: screening, Lindhardand Thomas-Fermi equations. Electron-electron interactions inmolecular crystals: Hubbard model. Electron-phonon interaction.
OPTICAL PROPERTIES OF SOLIDS
Absorbance, reflectance, and Kramers-Kronig transformation. Optical spectra of metals:
plasme frequency, plasmons. Optical spectra of molecular crystals: excitons and factor group selection rules. Oriented gas model.
MAGNETIC PROPERTIES OF SOLIDS
Diamagnetism.Paramagnetism: Langevin e di Van Vleck models. Ferromagnetism andantiferromagnetism: Curie-Weiss law. Microscopic model and Heisemberghamiltonian. Ferrimagnetism.
ELECTRON MOTION AND TRANSPORT PROPERTIES
Metal conductivity: semiclassical model. Electrons and holes. Resistance in metals. Semiconductors. Superconductors.
S. Elliott, "The Physics and Chemistry of Solids" (Wiley, 1998)
P.A. Cox, "The Electronic Structure and Chemistry of Solids" (Oxford University press, 1995)