## Introduction to Solid State Physics |

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Page 65

type to atoms of a second type, so that the crystal is made up of positive and

negative

**IONIC**CRYSTALS In**ionic**crystals electrons are transferred from atoms of onetype to atoms of a second type, so that the crystal is made up of positive and

negative

**ions**. The**ions**arrange themselves so the Coulomb attraction between**ions**of ...Page 71

The distance between a positive

chloride is known to be 2.81 × 10^ cm, so that the attractive part of the potential

energy of the two

” ergs ...

The distance between a positive

**ion**and the nearest negative**ion**in sodiumchloride is known to be 2.81 × 10^ cm, so that the attractive part of the potential

energy of the two

**ions**by themselves is e”/ro = (4.8 × 10−")*/(2.8 × 10^*) = 8 × 10” ergs ...

Page 74

The definition of the Madelung constant a is, from Eq. (3.3), f Cy F Y (+)p, ', J

where now, if we take the reference

be used for positive

definition ...

The definition of the Madelung constant a is, from Eq. (3.3), f Cy F Y (+)p, ', J

where now, if we take the reference

**ion**as a negative charge, the plus sign willbe used for positive

**ions**and the minus sign for negative**ions**. An equivalentdefinition ...

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absorption acceptors alkali alloys approximately atoms axis barium titanate boundary Bragg Brillouin zone calculated chapter charge conduction band conduction electrons crystal structure cube cubic Curie point Debye density dielectric constant diffraction diffusion dipole direction discussion dislocation distribution domain effective mass elastic electric field energy equation equilibrium exciton experimental F centers factor Fermi ferroelectric ferromagnetic free electron frequency germanium given heat capacity hexagonal holes impurity interaction ionization ions lattice constant lattice point low temperatures magnetic field magnetic moment metals molecules motion nearest neighbor normal observed p-n junction paramagnetic particles phonons Phys physics plane polarizability polarization positive potential Proc region resonance result room temperature rotation semiconductor Shockley shown in Fig sodium chloride solid solution space group specimen spin superconducting surface susceptibility symmetry Table theory thermal tion transition unit volume vacancies valence band values vector velocity wave functions wavelength zero