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Mercury dilatometry in physical ageing study of a-Se
Authors: Svoboda Roman | Pustková Pavla | Málek Jiří
Year: 2006
Type of publication: článek v odborném periodiku
Name of source: Scientific Papers of the University of Pardubice, Series A, Faculty of Chemical Technology
Publisher name: Univerzita Pardubice
Place: Pardubice
Page from-to: 81-99
Titles:
Language Name Abstract Keywords
cze Využití rtuťové dilatometrie při studiu fyzikálního stárnutí a-Se Objemová relaxace amorfního selenu (a-Se) byla studována pomocí rtuťové dilatometrie. Dva odlišně konstruované dilatometry byly použity ke studiu vlivu experimentálního uspořádání na relaxační experimenty. Z neizotermních experimentů byla určena teplota skelné transformace a koeficienty teplotní roztažnosti ve skle a podchlazené tavenině. Byly provedeny čtyři sady izotermních experimentů za účelem studia objemové relaxace a-Se. Tool-Naraynaswamy-Moynihanův model byl aplikován při popisu relaxačního chování. Všechny čtyři sady izotermních experimentů byly popsány pomocí jedné sady TNM parametrů. Vyhodnocení kombinovaných experimentů se zdá být nejvhodnější ke studiu strukturní relaxace z důvodu minimální ztráty informace na začátku experimentu. Vliv reakce rtuti a amorfního selenu na relaxační měření byl vyhodnocen jako zanedbatelný. amorfní selen, objemová relaxace, rtuťová dilatometrie, TNM model
eng Mercury dilatometry in physical ageing study of a-Se Volume relaxation of amorphous selenium (a-Se) was studied by mercury dilatometry. Two differently constructed dilatometers (dissimilar sensitivity of sample volume change and dissimilar values of characteristic time constants of the dilatometers) were used to study the influence of experimental setting on the relaxation measurements. Temperature of glass transition and thermal expansion coefficients in glassy and undercooled liquid state were determined from non-isothermal experiments. Four sets of isothermal experiments including temperature down-jump, up-jump and combined experiments were performed to study the volume relaxation. The Tool-Narayanaswamy-Moynihan model was applied to describe the relaxation behavior of a-Se. All four sets of isothermal experiments were described using one set of TNM parameters. The combined experiments were considered to be the most suitable for studying the structural relaxation because of the minimum of the information lost at the beginning of the experiment. The reaction of a-Se and mercury was found not to be influencing the results of volume relaxation measurements. amorphous selenium, volume relaxation, mercury dilatometry, TNM model

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