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Volume relaxation of a-Se studied by mercury dilatometry
Authors: Svoboda Roman | Pustková Pavla | Málek Jiří
Year: 2006
Type of publication: článek v odborném periodiku
Name of source: Journal of Non-Crystalline Solids
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 4793-4799
Titles:
Language Name Abstract Keywords
cze Objemová relaxace a-Se studovaná pomocí rtuťové dilatometrie Ke studiu objemové relaxace amorfního selenu (a-Se) byla použita rtuťová dilatometrie. Vliv experimentálního uspořádání a reaktivita a-Se se rtutí byly sledovány pomocí dvou dilatometrů různé konstrukce (odlišná citlivost změny objemu vzorku a odlišná hodnota charakteristického času dilatometru). Byly provedeny tři typy objem-čas-teplota experimentů. Teplota skelné transformace a koeficient teplotní délkové roztažnosti skla a podchlazené kapaliny byly určeny z neizotermních experimentů. Objemová relaxace byla studována převážně za isotermních podmínek. Bylo zjištěno, že klasické izotermní relaxační experimenty jsou silně ovlivněny ztrátou informace na začátku experimentu. Kdežto experiment s komplexní teplotní historií je ovlivněn méně a je vhodnější pro studium strukturní relaxace. Z experimentů vyplývá, že reakce a-Se a rtuti neovlivňuje výsledky měření strukturní relaxace. chalkogenidy, strukturní relaxace, amorfní selen, dilatometrie
eng Volume relaxation of a-Se studied by mercury dilatometry Mercury dilatometry was used to study volume relaxation of amorphous selenium (a-Se). Influence of experimental setting and reactivity of a-Se with mercury was studied using two differently constructed dilatometers (dissimilar sensitivity of sample volume change and dissimilar values of characteristic time constants of the dilatometers). Three types of volume-time-temperature experiments were made. Temperature of glass transition and thermal expansion coefficients in glassy and liquid state were determined from non-isothermal experiments. Volume relaxation was studied mainly on the basis of isothermal experiments. It was found that classical isothermal relaxation experiments are strongly influenced by the loss of information at the experiment beginning due to the proceeding relaxation. On the other hand, more complex thermal history experiments seem to be less dependent on these procedural parameters and were considered as most suitable for studying structural relaxation. The reaction of a-Se and mercury was found not to be influencing the results of volume relaxation measurements. Chalcogenides, structural relaxation, amorphous selenium, dilatometry

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