The influence of aluminum oxide on mechanical properties of K{sub 2}O-Al{sub 2}O{sub 3}-P{sub 2}O{sub 5} metaphosphate glasses and the role of aluminium in their structure
- Ioffe Physicotechnical Institute, St. Petersburg (Russian Federation)
The structure and mechanical properties (the elastic modulus, microhardness, structural strength, and fracture toughness) of the K{sub 2}O-Al{sub 2}O{sub 3}-P{sub 2}O{sub 5} metaphosphate glasses were studied depending on the Al{sub 2}O{sub 3}/(K{sub 2}O+Al{sub 2}O{sub 3}) ratio, which was varied between 0.2 and 1. Raman spectroscopic study has been carried out to demonstrate that the aluminum ion exhibits an octahedral coordination in these glasses, that is, it manifests itself as a modifier. As the content of alumina in the glass increases, the ionic interaction between chain structures becomes more pronounced resulting in an enhancement of the main mechanical properties: the elastic modulus and structural strength increase by a factor of about three, while the microhardness increases twofold. The fracture toughness only slightly changes over all range of variations in the glass composition, that is, there is no correlation of the fracture toughness with the elastic modulus and structural strength.
- OSTI ID:
- 171842
- Journal Information:
- Glass Physics and Chemistry, Journal Name: Glass Physics and Chemistry Journal Issue: 2 Vol. 21; ISSN GPHCEE
- Country of Publication:
- United States
- Language:
- English
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