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Relaxation processes in Se-rich chalcogenide glasses: Effect of characteristic structural entities
Authors: Svoboda Roman
Year: 2013
Type of publication: článek v odborném periodiku
Name of source: Acta Materialia
Publisher name: Pergamon-Elsevier Science Ltd.
Place: Oxford
Page from-to: 4534-4541
Titles:
Language Name Abstract Keywords
cze Relaxační procesy v Se-bohatých chalkogenidových sklech; Efekt charakteristických strukturních jednotek Strukturní relaxační procesy byly studovány pomocí diferenciální skenovací kalorimetrie pro řadu složení patřících k Se-bohaté straně chalkogenidových systémů Se-Te, Ge-Se, As-Se. Na základě výsledků fitovacích a nefitovacích metod bylo relaxační chování popsáno pomocí TNM modelu. Cílem článku je uvést pokročilý model popisující vztah mezi makroskopickým relaxačním chováním a molekulární strukturou skla. strukturní relaxace; modelování; Se skla; vztah struktura-vlastnosti; DSC
eng Relaxation processes in Se-rich chalcogenide glasses: Effect of characteristic structural entities Structural relaxation processes were studied by means of differential scanning calorimetry for a number of compositions belonging to the Se-rich sides of Se-Te, Ge-Se and As-Se chalcogenide systems. Based on the results of fitting and non-fitting methods, the relaxation behavior of these selenide glasses is described in terms of the Tool-Narayanaswamy-Moynihan (TNM) equations. The goal of this paper is to introduce an advanced model describing the relationship between the macroscopic relaxation behavior and molecular structure of the glass. Special attention is paid to differences between the particular structural units and molecular arrangements characteristic for each system studied. The TNM parameters as well as their changes are discussed with respect to both the increasing content of dopant in the Se matrix within each chalcogenide system and different structural units employed in the respective systems. A unique novel conception is suggested, showing a connection between the values of TNM parameters and respective molecular structures and their changes during structural relaxation. structural relaxation; modeling; selenide glasses; structure-property relationship; differential scanning calorimetry

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