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- W2043065665 abstract "A mean-field approach is applied to the lattice dynamics of quaternary alloys. Specific results are obtained for the quaternaries AlxGa1−xAs1−yPy and GaxIn1−xP1−yAsy. Calculations are restricted to a mass-disordered linear chain model. For the end-member components the approach reproduces the results of the coherent-potential approximation (CPA). The cluster density of states of eight atoms embedded in the mean-field effective medium is compared with the numerical spectrum obtained for a 20000-atom random chain by using the negative eigenvalue theorem. The predictions of the calculated mean-field dielectric susceptibility agree at least qualitatively with experimental results. With some qualifications the approach can explain the change of mode behaviour within the composition range, as it is expected to occur in some III–V quaternary alloys. Eine Näherung des mittleren Feldes wird auf die Gitterdynamik quaternärer Mischkristalle angewandt. Spezielle Resultate werden für die Systeme AlxGa1−xAs1−yPy und GaxIn1−xP1−yAsy erhalten. Die Berechnungen beschränken sich auf ein lineares Kettenmodell mit Massenunordnung. Für die Endkomponenten werden die Resultate der Näherung des kohärenten Potentials (CPA) reproduziert. Die Cluster-Zustandsdichte von acht Atomen, die in ein effektives Medium des mittleren Feldes eingebettet sind, wird mit dem numerischen Spektrum einer aus 20000 zufällig verteilten Atomen bestehenden Kette verglichen, das mit Benutzung des negativen Eigenwert-Theorems erhalten wurde. Mit einigen Einschränkungen kann dieser Zugang die Änderung des Modenverhaltens mit der Konzentration erklären, wie das für einige quaternäre III–V-Mischkristalle erwartet wird." @default.
- W2043065665 created "2016-06-24" @default.
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- W2043065665 date "1985-01-01" @default.
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- W2043065665 title "Self-Consistent Field Approximation for the Vibrational Spectra of Quaternary Alloys" @default.
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- W2043065665 doi "https://doi.org/10.1002/pssb.2221270110" @default.
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