1 Department of Chemistry and Bioscience, The Faculty of Engineering and Science, Aalborg University, VBN2 The Faculty of Engineering and Science (ENG), Aalborg University, VBN3 Section of Chemistry, The Faculty of Engineering and Science, Aalborg University, VBN4 Inorganic Amorphous Materials, The Faculty of Engineering and Science, Aalborg University, VBN5 Xi'an Jiaotong University6 Xi'an Jiaotong University
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.
American Ceramic Society. Journal, 2013, Vol 96, Issue 10, p. 3035-3037