Author(s)

J. Kapelewski

Abstract

The aim of the paper is to outline a consistent method for treating changes in overall macroscopic material parameters of produced by some point centres of a microdistortion. The paper treats the problem in microscopic terms. Main emphasis is focused at the formulation of a general methodology in which a semiphenomenological treatment, leading to relatively simple closed-form expressions, can be formulated. The method involves the use of localized representation of lattice vibrations with a separate treatment of the central near-defect regions responsible for the phenomena in consideration. 1 Introduction There is now considerable interest in investigations directed toward inducing a controllable change in material properties of crystals brought about by impurity defects. Especially interesting in this aspect a

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