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Using the breathing shell model with second neighbour interactions taken into consideration, dispersion curves are calculated without any least squares fitting to experimental curves. Accurate calculations are also made of the phonon density of states for all twenty alkali halides. The separate contributions for the positive and negative ions to the phonon density of states are reported. Unter Berucksichtigung von Wechselwirkung mit zweitnachsten Nachbarn werden mit dem „Breathing-Shell-Modell” Dispersionskurven ohne Anpassung an experimentelle Kurven berechnet. Genaue Berechnungen der Phononenzustandsdichte werden fur alle zwanzig Alkalihalogenide durchgefuhrt. Die Beitrage der positiven und negativen Ionen zur Phononenzustandsdichte werden angegeben.
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F. Dochy (1980) studied this question.
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