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<dc:title xml:lang="en">Disordered and hybrid materials : structural, bonding, and thermal properties through atomistic simulations</dc:title>
<dcterms:alternative xml:lang="fr">Matériaux désordonnés et hybrides : propriétés structurales, de liaison et thermiques par simulations atomistiques</dcterms:alternative>
<dc:subject xml:lang="fr">Dynamique moléculaire</dc:subject>
<dc:subject xml:lang="fr">Premiers principes</dc:subject>
<dc:subject xml:lang="fr">DFT</dc:subject>
<dc:subject xml:lang="fr">CMD</dc:subject>
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<dc:subject xml:lang="fr">Modélisation</dc:subject>
<dc:subject xml:lang="fr">Ge2Sb2Te5</dc:subject>
<dc:subject xml:lang="fr">GeSe</dc:subject>
<dc:subject xml:lang="fr">CuOHAc</dc:subject>
<dc:subject xml:lang="en">Molecular dynamics</dc:subject>
<dc:subject xml:lang="en">First-principles</dc:subject>
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<dc:subject xml:lang="en">Ge2Sb2Te5,</dc:subject>
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<dc:subject xml:lang="en">CuOHAc</dc:subject>
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<tef:elementdEntree autoriteExterne="034762590" autoriteSource="Sudoc">Matériaux hybrides</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Le présent travail de thèse englobe une étude approfondie au moyen de modélisation atomistique des descriptions quantitatives des propriétés (structure, liaison et thermique) de différents matériaux à des températures finies. Le chapitre d'introduction pose le contexte, suivi d'un deuxième chapitre offrant une vue d'ensemble des méthodes computationnelles utilisées. Les chapitres suivants se concentrent sur trois matériaux spécifiques : le tellure d'antimoine germanium amorphe (aGST), le germanium sélénium liquide et amorphe (lGeSe et aGeSe), et l'acétate d'hydroxyde de cuivre hybride (CuOHAc). Les trois matériaux sont rigoureusement étudiés à l'aide de la dynamique moléculaire des premiers principes et de la dynamique moléculaire classique pilotée par des potentiels interatomiques d'apprentissage automatique. Pour le aGST, les objectifs sont de décrire quantitativement sa structure et d'analyser sa conductivité thermique à l'échelle nanométrique. Pour le germanium sélénium liquide et amorphe, les objectifs incluent des descriptions quantitatives de la structure et de la dynamique de lGeSe, ainsi qu'une étude exploratoire de la structure de aGeSe. Le dernier chapitre explore la structure et les propriétés de liaison du CuOHAc sous différents ensembles à des températures finies, évaluant également pour la première fois le rôle des éventuels effets quantiques nucléaires. Ces objectifs améliorent collectivement notre compréhension de ces matériaux et offrent des perspectives précieuses sur leurs propriétés structurelles et leur comportement thermique. Les perspectives futures sont exposées dans le dernier chapitre.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis encompasses a comprehensive study by means of atomistic modeling of quantitative property descriptions structure, bonding and thermal) of different materials at finite temperatures. The introductory chapter sets the stage of context, followed by a second chapter offering an overview of the computational methods used. The subsequent chapters focus on three specific materials: amorphous Ge2Sb2Te5 (aGST), liquid and amorphous GeSe (lGeSe and aGeSe), and hybrid copper hydroxide acetate (CuOHAc). All three materials are thoroughly investigated using both first-principles molecular dynamics and classical molecular dynamics driven by machine-learning interatomic potentials. For aGST, the objectives are to quantitatively describe its structure and analyze its thermal conductivity at the nanoscale. For liquid and amorphous GeSe, the goals include quantitative structure and dynamic descriptions of lGeSe and an exploratory study of the structure of amorphous aGeSe. The last chapter explores the structure and bonding properties of CuOHAc under different ensembles at finite temperatures also assessing, for the first time, the role of nuclear quantum effects.These objectives collectively enhance our understanding of these materials and offer valuable insights into their structural properties and thermal behavior. Future prospects are outlined in the final chapter.</dcterms:abstract>
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