Calorimetric signature of structural heterogeneity in a ternary silicate glass

Yanfei Zhang, G. Yang, Yuanzheng Yue

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16 Citationer (Scopus)

Abstrakt

We investigate the structural heterogeneity in a silicate glass by hyperquenching–annealing–calorimetry approach. The results show a striking phenomenon: two separated sub-Tg relaxation peaks appear on the calorimetric curve of the hyperquenched CaO–MgO–SiO2 glass, implying the existence of two distinct structural domains of higher and lower potential energies, respectively. The higher energy domains in nanoscale are so unstable that they become ordered during hyperquenching. This is verified by the high-resolution transmission electron microscopy image exhibiting nanoordered domains in the glass matrix. The higher energy domains relax similar to a
strong glass phase, whereas the lower energy domains do similar to a fragile one.

OriginalsprogEngelsk
TidsskriftJournal of the American Ceramic Society
Vol/bind96
Udgave nummer10
Sider (fra-til)3035-3037
Antal sider3
ISSN0002-7820
DOI
StatusUdgivet - 2013

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