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Calorimetric Signature of Structural Heterogeneity in a Ternary Silicate Glass
Author(s) -
Zhang Yanfei,
Yang Guang,
Yue Yuanzheng
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12562
Subject(s) - calorimetry , ternary operation , silicate , annealing (glass) , materials science , silicate glass , relaxation (psychology) , transmission electron microscopy , supercooling , chemical physics , mineralogy , crystallography , thermodynamics , chemistry , nanotechnology , physics , metallurgy , psychology , social psychology , organic chemistry , computer science , programming language
We investigate the structural heterogeneity in a silicate glass by hyperquenching–annealing–calorimetry approach. The results show a striking phenomenon: two separated sub‐ T g relaxation peaks appear on the calorimetric curve of the hyperquenched CaO – MgO – SiO 2 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.