Qiao, Ang

Tao, Haizheng

Yue, Yuanzheng

English

    Aalborg UniversitetUnderstanding the sub-Tg relaxation in mechanically excited chalcogenide glasses bycomparison with hyperquenched glassesYue, Yuanzheng; Qiao, Ang; Tao, HaizhengPublication date:2017Document VersionPublisher's PDF, also known as Version of recordLink to publication from Aalborg UniversityCitation for published version (APA):Yue, Y., Qiao, A., & Tao, H. (2017). Understanding the sub-Tg relaxation in mechanically excited chalcogenideglasses by comparison with hyperquenched glasses. Abstract from 12th Pacific Rim Conference on Ceramicand Glass Technology including Glass & Optical Materials Division Meeting 2017, Waikoloa, United States.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            ? Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            ? You may not further distribute the material or use it for any profit-making activity or commercial gain            ? You may freely distribute the URL identifying the publication in the public portal ?Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: December 25, 2020Understanding the sub-Tg relaxation in mechanically excited chalcogenide glasses by comparison with hyperquenched glasses Yuanzheng Yue1,2*,  Ang Qiao1, Haizheng Tao1 1 State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China 2 Department of Chemistry and Bioscience, Aalborg University, DK-9220 Aalborg, Denmark *Corresponding author. E-mail: yy@bio.aau.dk    We investigate the sub-Tg enthalpy relaxation in a milling derived, i.e., mechanically excited (ME) chalcogenide glass (Ag3PS4 glass) by comparing with the hyperquenched (HQ) (>105 K/s) oxide and metallic glasses. This has been done using differential scanning calorimetry (DSC). We have found that two distinct, but also correlated peaks of sub-Tg energy release with similar intensity occur in the ME glass during DSC upscanning. Such relaxation pattern is in strong contrast to the asymmetric peak observed in the HQ oxide and metallic glasses. The low-temperature relaxation peak of the ME glass is attributed to -relaxation. -relaxation originates from the local motion of mobile silver ions from unstable to relatively stable sites. The high-temperature peak is a result of the -relaxation associated with the recovery of the distorted covalently bonded PS4 units. However, for the HQ glasses, the low-temperature peak is manifested as a shoulder superimposed on the main peak. The HQ glasses lie significantly higher on potential energy landscape than the ME glass. This work implies that the ME glass is of higher structural heterogeneities than the HQ ones.   

Understanding the sub-Tg relaxation in mechanically excited chalcogenide glasses by comparison with hyperquenched glasses

https://vbn.aau.dk/ws/files/259795682/abstract_relaxation_for_PacRim_2016_Yuanzheng_Yue_final1.docx.pdf

Understanding the sub-Tg relaxation in mechanically excited chalcogenide glasses by comparison with hyperquenched glasses

Abstract

Similar works

Full text

Available Versions

VBN