Doping of iron phosphate glasses with Al2O3, SiO2 or B2O3 for improved thermal stability

BINGHAM, Paul, HAND, R.J. and FORDER, S.D. (2006). Doping of iron phosphate glasses with Al2O3, SiO2 or B2O3 for improved thermal stability. Materials Research Bulletin, 41 (9), 1622-1630.

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The effects of doping 60 P2O5–40 Fe2O3 (mol%) glasses with 5–10 mol% SiO2, Al2O3 or B2O3 on their thermal stability, iron environments and redox were investigated. Thermal stability improved markedly with 5% dopant addition in the order Al2O3 > SiO2 > B2O3 ≫ base glass. Solubility of pro rata additions when melted at 1150 °C was 5–10% SiO2, <5% Al2O3, and >10% B2O3. It was possible to dissolve 5% Al2O3 by replacing Fe2O3. These additions generally had little effect on dilatometric measurements and iron environments, however the Fe2+/ΣFe redox ratio increased in the order base glass < Al2O3 < SiO2 < B2O3. This behaviour was broadly consistent with the effects of glass basicity. The increased thermal stability of these glasses may improve their suitability for applications such as waste immobilisation or sealing.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
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Page Range: 1622-1630
Depositing User: Hilary Ridgway
Date Deposited: 06 Sep 2012 13:25
Last Modified: 18 Mar 2021 09:45

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