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- W2232203265 abstract "The relation between electronic structure and cohesion of materials has been a permanent quest of Jacques Friedel and his school. He developed simple models that are of great value as guidelines in conjunction with ab initio calculations. His local approach of bonding has both the advantages of a large field of applications including non-crystalline materials and a common language with chemists. Along this line, we review some fascinating behaviors of covalent materials, most of them showing a Peierls (symmetry breaking) instability mechanism, even in liquid and amorphous materials. We analyze the effect of external parameters such as pressure and temperature. In some temperature ranges, the Peierls distortion disappears and a negative thermal expansion is observed. In addition, the Peierls distortion plays a central role in Phase-Change Materials, which are very promising non-volatile memories. La relation entre structure électronique et cohésion des matériaux a été un sujet d'étude permanent de Jacques Friedel et de son école. Il a développé des modèles simples, intuitifs qui se sont révélés des guides d'une grande valeur et par la suite un complément utile aux calculs ab initio. Son approche locale de la liaison chimique s'applique à un vaste champ de systèmes, incluant les matériaux non cristallins et permis un langage commun avec les chimistes. Dans cet axe nous passons en revue quelques comportements fascinants des matériaux covalents, la plupart d'entre eux présentant un mécanisme d'instabilité de Peierls (brisure de symétrie), même les liquides et les amorphes, étonnamment. Nous analysons aussi l'effet de parame‘tres externes tels que la pression et la température. Dans un certain domaine de température, la distorsion de Peierls disparaît et une dilatation thermique négative est observée. Enfin, la distorsion de Peierls joue un rôle central dans les matériaux à changement de phase (PC materials), qui sont très prometteurs pour la réalisation de mémoires non volatiles." @default.
- W2232203265 created "2016-06-24" @default.
- W2232203265 creator A5029305818 @default.
- W2232203265 date "2016-03-01" @default.
- W2232203265 modified "2023-09-25" @default.
- W2232203265 title "Structure of covalently bonded materials: From the Peierls distortion to Phase-Change Materials" @default.
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- W2232203265 doi "https://doi.org/10.1016/j.crhy.2015.12.009" @default.
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