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Enthalpy relaxation kinetics of Ge20Te(80-y)Sey far-infrared glasses in the glass transition range
Year: 2016
Type of publication: článek v odborném periodiku
Name of source: Philosophical Magazine
Publisher name: Taylor & Francis Ltd.
Place: Abingdon
Page from-to: 1623-1631
Titles:
Language Name Abstract Keywords
cze Entalpická relaxační kinetikaGe20Te(80-y)Sey infračervených skel v oblasti skelného přechodu Pomocí DSC byla studována entalpická relaxace skel pro infračervenou optiku Ge20Te(80-y)Sey obsahujících 0 - 8 at.% selenu. relaxační chování bylo popsáno na základě TNM modelu. Struktura skel byla stanovena na základě Ramanovy spektroskopie.
eng Enthalpy relaxation kinetics of Ge20Te(80-y)Sey far-infrared glasses in the glass transition range Differential scanning calorimetry was used to study enthalpy relaxation kinetics of the Ge20Te(80-y)Sey infrared chalcogenide glasses for the compositional range y=0-8. The relaxation behaviour was described in terms of the phenomenological Tool-Narayanaswamy-Moynihan (TNM) model. The direct curve-fitting procedure was used to determine the values of TNM parameters. Compositional evolution of the TNM parameters was interpreted with respect to the involved structural entities and their motions. Based on the joint Raman scattering study, the addition of Se leads to increased amount of edge-shared GeTe4-xSex tetrahedra. While the primary structural basis for the relaxation movements appears not to be affected by addition of Se (constant value of non-linearity), changes of the non-exponentiality parameter indicate increased structural variability occurring within the groups of directly interlinked tetrahedra, which were found to carry the main portion of relaxation movements. Increased activation energy was explained by the presence of significantly stronger Ge-Se bonds and increased amount of edge-shared tetrahedra. Enthalpy relaxation; TNM model; DSC; Ge-Te-Se glasses; Raman scattering

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