1. System of Na-aluminosilicate glasses Role of glass composition in plastic deformation NS_Al2NS_Al7NS_Al11 SiO 2 mol. % Na 2 O mol. %Al 2 O 3 mol. % 75 73 23 18 14,5 2 7 10,5 Model system: Na-aluminosilicate glasses Normal Anomalous Ph.D. dissertation of C. Sonneville (2013) Chemical compositions refined by XRF analysis 1

2. Glass structure evolution: diffusion technique Diffusion experiments: Gradual addition of Na and AlNS_Al11NS_Al7 NS_Al2 NS_Al7 1120°C, 1 heure 1200°C, 1 heure Fine evolution of Glass structure Mechanical properties Zone of gradient Analysis points: + Berkovich nano-indentation of 1500 nm depth NS_Al2 NS_Al7 Ph.D. C. Claireaux 2 µ-sonde points Raman points NS_Al2 NS_Al7 NS_Al11 Glass polymerization increase Spectra deconvolution: non-negative matrix factorization W. Woelffel (SVI)

3. Composition effect on Young modulus and hardness Fully polymerized and compensated Na-aluminosilicate network Combination of compensated network and mobile Na + vibrations 3

4. Deformation maps on NS_Al2 and NS_Al11 glasses NS_Al2 glass: 2 % mol. Al 2 O 3 NS_Al11 glass: Al 2 O 3 = Na 2 O Local structural rearrangements 4