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Unformatted text preview: that For the maxima holds: 2 d sin( ) = n . The Brillouin zone is defned as a Wigner-Seitz cell in the reciprocal lattice. 12.2 Crystal binding A distinction can be made between 4 binding types: 1. Van der Waals bond 2. Ion bond 3. Covalent or homopolar bond 4. Metalic bond. or the ion binding oF NaCl the energy per molecule is calculated by: E = cohesive energy(NaCl) ionization energy(Na) + electron aFfnity(Cl) The interaction in a covalent bond depends on the relative spin orientations oF the electrons constituing the bond. The potential energy For two parallel spins is higher than the potential energy For two antiparallel spins. urthermore the potential energy For two parallel spins has sometimes no minimum. In that case binding is not possible....
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- Spring '10
- Solid State Physics