Abstract
The lattice-distortions in the vicinity of anF-centre in alkalihalide crystals and the volume change arising from the lattice distortions around this defect are being calculated. Only theF-centre ground state is considered and the effect of lattice vibrations is neglected. The interaction of theF-electron with the ions is described in terms of effective potentials, and a vacancy-centered wave function is calculated for theF-electron. In calculating the lattice distortions, an approximative procedure is adopted in which only the ions in the vicinity of anF-centre receive an atomistic treatment whereas the remainder of the crystal is treated as an elastic continuum. The volume change caused by the lattice distortions around anF-centre is calculated, using a method ofFischer andHahn which does not require an exact knowledge of the asymptotic strainfield around the point defect.
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