Ab initio self-consistent calculations of the polarizability and related functions of cubic SiC

Crystalline orbitals obtained by the linear combination of atomic orbitals- self consistent field (LCAO-SCF) method at the Hartree-Fock (HF) and Kohn-S ham (KS) levels, are used to calculate the polarizability and related funct ions such as dielectric constant, reflectance, and energy loss function (EL F). Comparison of our calculations with experiment leads to a satisfactory agreement. The ELF spectra show clearly the energy ranges corresponding to the electronic excitations of the different orbitals. The carbon K-edge ran ge is accurately analyzed in connection with the density of states.