期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 477, 期 -, 页码 58-72出版社
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2017.09.043
关键词
Phosphate; Sulphate; Fluoride; Multi-anion; Anion mixing
资金
- European Research Council (ERC) under the European Union's Horizon research and innovation program (ERC grant UTOPES) [681652]
- Vietnam International Education Development (VIED) of the Ministry of Education and Training of Vietnam
Phosphate glasses exhibit high solubility for secondary anion species. This includes sulfate, fluoride or nitride ions, and enables the preparation of poly-anionic glasses. Here, we consider fluoro-sulfo-phosphates. We show that in this system, even equimolar anion mixing can be achieved without notably compromising the glass forming ability. The derived glasses exhibit surprising stability, what enables the fabrication of bulk samples mostly without the need to employ rapid quenching techniques. In terms of molecular structure, they rely on primarily ionic bonding among the different constituents, whereby the fluoride and sulfate anions seem to act as stabilizing ionic cross-linkers between highly-depolymerized phosphate entities. Investigation of the low-frequency Raman scattering indicates characteristic variations on intermediate-range structure, where a shift in the Boson peak appears to correlate inversely with increasing sulfate content. We discuss this observation in terms of the low level of bond localization and low field strength of the sulfate anion relative to phosphate Q groups. Adjusting the degree of anion competition enables to tailor super-structural heterogeneity. Beyond this, the glass system provides an interesting variety of ligand situations for the potential incorporation of optically active cation species.
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