Viscosity and Glass Transition in Amorphous Oxides

Table 3

Asymptotic Arrhenian activation energies for viscosity and the corresponding Doremus fragility ratios [47].

Amorphous material	𝑄𝐿, kJ/mol	𝑄𝐻, kJ/mol	𝑅𝐷
Silica (SiO2)	522	759	1.45
Germania (GeO2)	272	401	1.47
66.7SiO2 33.3PbO	274	471	1.72
80SiO2 20Na2O	207	362	1.75
65SiO2 35PbO	257	488	1.9
59.9SiO2 40.1PbO	258	494	1.91
75SiO2 25Na2O	203	436	2.15
75.9SiO2 24.1PbO	234	506	2.16
SLS: 70SiO2 21CaO 9Na2O	293	634	2.16
Salol (HOC6H4COOC6H5)	118	263	2.23
70SiO2 30Na2O	205	463	2.26
65SiO2 35Na2O	186	486	2.61
α-phenyl-o-cresol (2- Hydroxydiphenylmethane)	103	275	2.67
52SiO2 30Li2O 18B2O3	194	614	3.16
B2O3	113	371	3.28
Diopside (CaMgSi2O6)	240	1084	4.51
Anorthite (CaAl2Si2O8)	251	1135	4.52