TY  - JOUR
A1  - Holzer, Marco
A1  - Johansen, Sidsel M.
A1  - Christensen, Johan F.S.
A1  - Smedskjaer, Morten M.
A1  - Cicconi, Maria Rita
A1  - de Ligny, Dominique
A1  - Müller, Ralf
A1  - de Camargo, Andrea S.S.
A1  - Maaß, Robert
T1  - Direct connection between secondary relaxation mode and fracture toughness in alkali-aluminosilicate glasses
JF  - Materials Today Advances
N2  - Oxide glasses are intrinsically brittle, lacking sufficient atomic-scale mechanisms that can relax mechanical stresses in the vicinity of a propagating crack. As a result, fracture is typically well-captured by considering local bond rupture at the crack tip. Here we demonstrate that barrier energies related to the low-temperature 𝛾-relaxation mode in alkali-aluminosilicate glasses are inversely related to the fracture toughness measured via standardized three-point bending fracture experiments. This holds true for both a series with varying cations (Li, Na, K) and one with varying Li concentration. The structural rationale for this finding is gained via Raman spectroscopy. The findings suggest that a fundamental structural relaxation mode measured on bulk specimens can serve as an effective guideline for fracture toughness of oxide glasses. Data for additional silicate glasses support this conclusion.
KW  - Fracture toughness
KW  - Oxide glass
KW  - Mechanical properties
KW  - Alkali-aluminosilicate glasses
KW  - Internal friction
PY  - 2026
UR  - https://nbn-resolving.org/urn:nbn:de:kobv:b43-651540
DO  - https://doi.org/10.1016/j.mtadv.2025.100669
SN  - 2590-0498
VL  - 29
SP  - 1
EP  - 10
PB  - Elsevier Ltd.
CY  - Amsterdam, Niederlande
AN  - OPUS4-65154
LA  - eng
AD  - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER  -