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    Lattice vibrations induced by impurities in polar crystals

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    KleinH1980m-1b.pdf (2.803Mb)

    Date

    1980

    Author

    Klein, Heather

    Degree

    Master of Science

    Discipline

    Physics

    Subject

    Lattice dynamics
    Induced polarization

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    Abstract

    The effect of a single or a pair of polarizable impurities on the vibrational frequencies of a solid is investigated. It is shown that the introduction of impurities alters the energy of the crystal due to the coupling of the dipoles through the polarization of the impurities and perturbs the longitudinal-optical frequencies of the crystal. Both the perturbed frequency and the change in energy of the crystal are calculated explicitly and the results are examined at very small and very large separation of the impurities to demonstrate agreement with the literature.

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    http://knowledgecommons.lakeheadu.ca/handle/2453/2387

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