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- W2002966575 abstract "Abstract Dans les cristaux ioniques de type NaCl les contraintes de Peierls pour le glissement sur des plans {110} et {100} dépent de la température fortement au dessous d'une température critiquement. En addition le volume d'activation descend au dessous de 100 b3. Cette attitude peut étre expliquee par le mécanisme de Peierls. Les contraintes de Peierls estimees d'expérience réduit du second degrée de la valence des ions descend avec l'augmentation de la somme de polarisabilités des ions de la matrix (σα). La descente est plus grande pour le glissement sur {100} que sur {110}. Un change du plan de glissement primaire de {110} à {100} on peut s'attendre à σα≈9. Une com-paraison des contraintes de Peierls avec des résultats de calculs utilisants des modèles élastiques ou atomistiques montre que seulement les derniers sont en etat de décrire quantitativement la situation expérimentalle. In ionic crystals with the NaCl-structure the critical resolved shear stress for slip on {110} and {100} planes becomes strongly temperature dependent below a critical temperature. In addition the activation volume decreases below 100 b3. This behaviour can be explained in terms of a Peierls mechanism. The Peierls stresses estimated from experiment reduced on the square of the ion valency decrease with increasing sum of the polarizabilities of the matrix ions (σα). The decrease is larger for {100} than for {110} slip. A change of the primary slip plane from {110} to {100} is expected at σα≈9. A comparison of the Peierls stresses with elastic and atomistic model calculations shows that only the latter are able to describe the experimental situation quantitatively." @default.
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- W2002966575 date "1983-01-01" @default.
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- W2002966575 title "Peierls stresses of ionic crystals with the NaCl-structure" @default.
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- W2002966575 doi "https://doi.org/10.1080/00337578308218425" @default.
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