, rares dans les espaces interstitiels bloque ce processus de restructuration microscopique
on réalise ici pour la première fois l'analyse de la polarisation des spectres ,
, Elle révèle que dans la région en dessous de 200 cm ?1 correspondant au pic boson, les composantes VV et VH du spectre Raman évo-luent différemment avec la pression
, Modules élastiques et masse volumique de v-SiO 2 sous pression d'hélium et de ME4:1
, Variations volumiques de la silice vitreuse en fonction de la pression et différents milieux transmetteurs de pression
, Vitesses du son de v-SiO 2 comprimée dans He
, Modules élastiques de v-SiO 2 sous pression de néon et concentration de néon
, Variations du volume relatif de v-SiO 2 en fonction du temps à pression constante
, Propagation du front de diffusion de néon dans un échantillon de v-SiO 2, p.52
, Courbes d'adsorption et de désorption de néon à 2,1 GPa, p.54
, Extrapolation des courbes de fréquences aux pressions négatives, p.56
, Variations à l'équilibre et cinétique de la fréquence Brillouin LA de v-SiO 2 en fonction de la pression
, Dépendance en pression du module de compression du modèle de silice, p.61
, Isothermes d'adsorption à température ambiante dans v-SiO 2 obtenues par simulations GCMC en fonction de la pression du fluide, p.63
, Déformation volumique de v-SiO 2 en fonction de la pression exercée par des fluides pénétrants
, Concentration de fluide adsorbé dans v-SiO 2 obtenues par simulations numériques
, Spectroscopies vibrationnelles de v-SiO 2 à pression ambiante, p.70
,
, Densités d'états vibrationnels de v-SiO
, OM : microscope optique. -FI : filtre interférentiel. -?/2 : lame demi-onde. -FS :filtre spatial, vol.2
, Positionnement du volume diffusant dans les expériences de diffusion Raman
, Spectres Raman typiques VV et VH de v-Si0
81 2.8 Intensité spectrale transmise par le spectrographe et spectres Raman VV et VH corrigés ,
, Intensité Raman réduite VV et VH (I RS N /? 2 ) de v-SiO 2 sous pression d'argon, p.85
86 2.11 Fréquence de la bande R avec la densité (a) et comparaison de deux spectres Raman VV obtenus pour v-SiO 2 ,
, Modèle simple des vibrations couplées du motif A ? X ? A dans les structures tétraédriques AX 2 en fonction de l'angle inter-tétraèdrique, p.89
, Fréquence des modes TO 2 et TO 3 en fonction de la pression et de la densité atomique
Courbes d'adsorption et de désorption de néon à 1,2 GPa, p.98 ,
, Courbes d'adsorption et de désorption de néon à 2 GPa, p.99
Courbes d'adsorption et de désorption de néon à 4,2 GPa, p.100 ,
, Intensité Raman réduite VV et VH (I RS N /? 2 ) de v-SiO 2 sous pression d
/? 2 ) de v-SiO 2 sous pression d'hé-lium ,
,
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