Atomic simulation of electrooptic and magnetooptic oxide - download pdf or read online

By Hansjörg Donnerberg

ISBN-10: 354065111X

ISBN-13: 9783540651116

This publication stories the entire state of the art simulation tools used to enquire the atomistic-scale houses of technologically very important oxide fabrics. past and lots of contemporary effects are rigorously mentioned.

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2) the lattice energy of the crystal is written as a sum of atomic (ionic) self-energies and atomic (ionic) interaction contributions in the crystal. The method, which is applicable if the relevant group functions can be chosen as atomic(ionic)-in-crystal wavefunctions, has been tested for different alkali halides but not for complex oxides. The particular derivation of impurity-related potentials has been recently addressed by Pandey et al. [119]. The corresponding approach employs an embedded cluster description including defect-induced relaxations of the outer lattice spheres (see Sect.

1). In particular, for atomistic simulations of structure, energetics and impurity segregation at oxide surfaces the reader is referred to [111]. Note that these investigations also invoke Mott-Littleton type methods. 40 2. 2 Derivation of Effective Crystal Potentials In practice the generation of crystal potentials employs suitable fitting procedures. The first (theoretical) approach is based on fitting the calculated potential energy surface (PES) of either the total crystal or an appropriately chosen embedded molecular fragment.

Importantly, these functions do not improve the oxygen selfenergy. It is further noted that the expected polarization contributions are mainly due to the highly diffuse oxygen anion; the niobium cation, on the other hand, may be considered as being rigid to first order. g. [106, 112]), they provide completely unsatisfactory crystal descriptions for more covalent materials like KNbO3. This result is independent of the inclusion of the polarization term. O interaction in KNbO3. In the case of the (NbO6) 7- quantum cluster we consider two different sets of calculations.

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Atomic simulation of electrooptic and magnetooptic oxide materials by Hansjörg Donnerberg

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