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, Les analyses chimiques quantitatives des échantillons étudiés ici sont reportées dans les Tables D.1 (résultats exprimés en % massique) et D.2 (résultats exprimés en % molaire)

, Ces analyses ont été réalisées par les laboratoires des usines ou bien par le groupe « Chimie Analytique

, Propriétés des échantillons La chaleur spécifique des échantillons a été mesurée par calorimétrie différentielle à balayage (ou DSC, de l'anglais : Differential Scanning Calorimetry) par le groupe « Minéralogie Appliquée » du département EMC 2 de SGR. Les chaleurs spécifiques des verres fondus

?. Constantes and . Valent, 51 J kg ?1 K ?1 pour l'échantillon AS

, L'incertitude associée à la mesure de la chaleur spécifique est de l'ordre de 3% *. La masse volumique a été mesurée par la méthode (directe) du principe d'Archimède, p.182

, Murano (Italie) pour les échantillons SC1 et SC2. Les valeurs mesurées de la masse volumique en fonction de la température sont illustrées sur la Figure D.1. Les valeurs issues des régressions linéaires sont reportées dans la Table D.3. L'incertitude associée à la mesure de la masse volumique est inférieure à 0,5%. L'indice de réfraction des échantillons a été considéré comme constant et vaut 1,52 pour tous les échantillons. Cette valeur repose sur des mesures de spectrophotométrie, par le Laboratory of Glass Properties (LGP) à Saint-Pétersbourg (Russie) pour l'échantillon AS et par la Stazione Sperimentale del Vetro (SSV) à

. Le-protocole, de mesure a été validé à l'aide d'une inter-comparaison avec des mesures de calorimétrie par chute réalisées par Pascal Richet et ses collaborateurs à l

E. , Echantillon SC2

E. , 1 Thermogrammes expérimentaux Les thermogrammes réduits expérimentaux obtenus pour l'échantillon SC2 entre 1100 et

, Pour chaque température, entre trois et cinq thermogrammes expérimentaux ont été exploités. Les thermogrammes expérimentaux présentent un mauvais rapport signal sur bruit. Celui-ci est attribué à l'encrassement des hublots en séléniure de zinc (ZnSe) utilisés ici, ? C sont représentés sur les Figures E.25 à E.29