Yttrium doped phosphate-based glasses: structural and degradation analyses

Arafat, Abul; Samad, Sabrin A.; Titman, Jeremy J.; Lewis, Andrew L.; Barney, Emma R.; Ahmed, Ifty

Abstract

This study investigates the role of yttrium in phosphate-based glasses in the system 45(P2O5)-25(CaO)-(30-x)(Na2O)-x(Y2O3) (0≤x≤5) prepared via melt quenching and focuses on their structural characterisation and degradation properties. The structural analyses were performed using a combination of solid-state nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). 31P NMR analysis showed that depolymerisation of the phosphate network occurred which increased with Y2O3 content as metaphosphate units (Q2) decreased with subsequent increase in pyrophosphate species (Q1). The NMR results correlated well with structural changes observed via FTIR and XPS analyses. XRD analysis of crystallised glass samples revealed the presence of calcium pyrophosphate (Ca2P2O7) and sodium metaphosphate (NaPO3) phases for all the glass formulations explored. Yttrium-containing phases were found for the formulations containing 3 and 5 mol% Y2O3. Degradation analyses performed in Phosphate buffer saline (PBS) and Milli-Q water revealed significantly reduced rates with addition of Y2O3 content. This decrease was attributed to the formation of Y-O-P bonds where the octahedral structure of yttrium (YO6) cross-linked phosphate chains, subsequently leading to an increase in chemical durability of the glasses. The ion release studies also showed good correlation with the degradation profiles.

Citation

Arafat, A., Samad, S. A., Titman, J. J., Lewis, A. L., Barney, E. R., & Ahmed, I. (2020). Yttrium doped phosphate-based glasses: structural and degradation analyses. Biomedical Glasses, 6(1), 34-49. https://doi.org/10.1515/bglass-2020-0004

• Journal Article Type: Article
• Acceptance Date: Oct 17, 2020
• Online Publication Date: Nov 18, 2020
• Publication Date: Nov 18, 2020
• Deposit Date: Nov 23, 2020
• Publicly Available Date: Nov 23, 2020
• Journal: Biomedical Glasses
• Electronic ISSN: 2299-3932
• Peer Reviewed: Peer Reviewed
• Volume: 6
• Issue: 1
• Pages: 34-49
• DOI: https://doi.org/10.1515/bglass-2020-0004
• Keywords: Materials Chemistry; Surfaces, Coatings and Films; Ceramics and Composites; Electronic, Optical and Magnetic Materials
• Public URL: https://nottingham-repository.worktribe.com/output/5066450
• Publisher URL: https://www.degruyter.com/view/journals/bglass/6/1/article-p34.xml