On the change of thermal parameters in a glass during a Na/Tl ion-exchange-characterized by DTA measurements |
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Authors: | Ch Kaps W Ludwig A Feltz |
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Institution: | (1) Department of Chemistry, Friedrich Schiller University Jena D. D. R., 6900 Jena, G. D. R. |
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Abstract: | The Na/Tl exchange is investigated in two silicate glasses (Na2O·2SiO2 and crown-flint KF3 ) by estimation of concentration or refractive index profiles, resp. (c
Tl(x) orn(x)). The forms of the profiles are discussed in connection with changes of the glass transition temperature Tg owing to an increase of Tl2O contents, determined by DTA on homogeneous glass samples. During the Na/Tl exchange the local and temporal enlargement of the Tl2O content causes a drastic decrease ofT
g(x, t) values and of the viscosity (x, t), which yields a remarkable acceleration of the Na/Tl interdiffusion.
Zusammenfassung Der Na/Tl-Austausch wird in zwei Silicatgläsern (Na2O.2SiO2 und Kron-Flintglass KF3 ) anhand der Bestimmung von Konzentrations- oder Brechzahlprofilen (c
Tl(x) odern(x)) untersucht. Die Profilformen werden im Zusammenhang mit Änderungen der Glastransformations-TemperaturT
g bei steigendem Tl2O-Gehalt diskutiert, die mittels DTA an homogenen Glasproben bestimmt wurden. Während des Na/Tl-Austausches verursacht die lokale und zeitliche Erhöhung des Tl2O-Gehaltes ein drastisches Absinken derT
g(x, t)-Werte bzw. der Viskosität (x, t), das zu einer bemerkenswerten Beschleunigung der Na/Tl-Interdiffusion führt.
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g( , t) i ![vcy](/content/j4l3801t866l0742/xxlarge1074.gif) ![yacy](/content/j4l3801t866l0742/xxlarge1103.gif) ![zcy](/content/j4l3801t866l0742/xxlarge1079.gif) ![kcy](/content/j4l3801t866l0742/xxlarge1082.gif) ![ocy](/content/j4l3801t866l0742/xxlarge1086.gif) ![scy](/content/j4l3801t866l0742/xxlarge1089.gif) ![tcy](/content/j4l3801t866l0742/xxlarge1090.gif) (x,t), ![chcy](/content/j4l3801t866l0742/xxlarge1095.gif) ![tcy](/content/j4l3801t866l0742/xxlarge1090.gif) ![vcy](/content/j4l3801t866l0742/xxlarge1074.gif) ![ycy](/content/j4l3801t866l0742/xxlarge1099.gif) ![zcy](/content/j4l3801t866l0742/xxlarge1079.gif) ![ycy](/content/j4l3801t866l0742/xxlarge1099.gif) ![acy](/content/j4l3801t866l0742/xxlarge1072.gif) ![iecy](/content/j4l3801t866l0742/xxlarge1077.gif) ![ncy](/content/j4l3801t866l0742/xxlarge1085.gif) ![iecy](/content/j4l3801t866l0742/xxlarge1077.gif) ![ocy](/content/j4l3801t866l0742/xxlarge1086.gif) ![bcy](/content/j4l3801t866l0742/xxlarge1073.gif) ![ycy](/content/j4l3801t866l0742/xxlarge1099.gif) ![kcy](/content/j4l3801t866l0742/xxlarge1082.gif) ![ncy](/content/j4l3801t866l0742/xxlarge1085.gif) ![ocy](/content/j4l3801t866l0742/xxlarge1086.gif) ![vcy](/content/j4l3801t866l0742/xxlarge1074.gif) ![iecy](/content/j4l3801t866l0742/xxlarge1077.gif) ![ncy](/content/j4l3801t866l0742/xxlarge1085.gif) ![ncy](/content/j4l3801t866l0742/xxlarge1085.gif) ![ocy](/content/j4l3801t866l0742/xxlarge1086.gif) ![ucy](/content/j4l3801t866l0742/xxlarge1091.gif) ![scy](/content/j4l3801t866l0742/xxlarge1089.gif) ![kcy](/content/j4l3801t866l0742/xxlarge1082.gif) ![rcy](/content/j4l3801t866l0742/xxlarge1088.gif) ![iecy](/content/j4l3801t866l0742/xxlarge1077.gif) ![ncy](/content/j4l3801t866l0742/xxlarge1085.gif) ![icy](/content/j4l3801t866l0742/xxlarge1080.gif) Na/Tl ![vcy](/content/j4l3801t866l0742/xxlarge1074.gif) ![zcy](/content/j4l3801t866l0742/xxlarge1079.gif) ![acy](/content/j4l3801t866l0742/xxlarge1072.gif) ![icy](/content/j4l3801t866l0742/xxlarge1080.gif) ![mcy](/content/j4l3801t866l0742/xxlarge1084.gif) ![ncy](/content/j4l3801t866l0742/xxlarge1085.gif) ![ocy](/content/j4l3801t866l0742/xxlarge1086.gif) ![dcy](/content/j4l3801t866l0742/xxlarge1076.gif) ![icy](/content/j4l3801t866l0742/xxlarge1080.gif) ![fcy](/content/j4l3801t866l0742/xxlarge1092.gif) ![ucy](/content/j4l3801t866l0742/xxlarge1091.gif) ![zcy](/content/j4l3801t866l0742/xxlarge1079.gif) ![icy](/content/j4l3801t866l0742/xxlarge1080.gif) .
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