Mechanical property optimization of a zinc borate glass by lanthanum doping

Kacper Januchta, Randall E. Youngman, Lars Rosgaard Jensen, Morten Mattrup Smedskjær

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2 Citationer (Scopus)

Abstrakt

All known oxide glasses are inherently brittle, but their resistance to damage such as hardness and crack resistance varies strongly as a function of the chemical composition. The damage resistance is in turn related to the underlying deformation mechanism, which is at least partly related to the Poisson's ratio. That is, glasses with high Poisson's ratio tend to mostly deform through shear flow relative to densification, which leads to ductility in metallic glasses for Poisson's ratio above ~0.33. In this study, we investigate the structure and mechanical properties of a binary zinc borate glass with a relatively high Poisson's ratio (0.30), which we modify by partial substitution of ZnO with La 2O 3. Glass transition temperature, density, Vickers hardness and crack resistance, as well as elastic constants are studied, in addition to the short and intermediate range structure as probed by 11B solid-state NMR and Raman spectroscopy. We find that the substitution of La for Zn leads to a monotonic increase in Poisson's ratio and elastic moduli, while local maxima are recorded in the trends of glass transition temperature, hardness, and crack resistance. Correlations between the mechanical and structural properties are discussed to shed light onto the structural origin of damage resistance in oxide glasses with high Poisson's ratio.

OriginalsprogEngelsk
Artikelnummer119461
TidsskriftJournal of Non-Crystalline Solids
Vol/bind520
Antal sider8
ISSN0022-3093
DOI
StatusUdgivet - 15 sep. 2019

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  • Projekter

    • 1 Igangværende

    Glass Mechanical Properties: Structural Origins and Engineering

    Smedskjær, M. M., Yue, Y., Somers, M. A. J., Januchta, K. & To, T.

    01/10/201628/02/2021

    Projekter: ProjektForskning

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