Glass formation from iron-rich phosphate melts

Iron-rich phosphate glasses with nominal Fe/P ratios between 1.0 and 1.6 were prepared by a roller-quenching technique. The critical cooling rates (CCR) for glass formation were estimated by differential thermal analysis and found to be in the range of 10 3–10 4 °C/s for the iron-rich melts, compare...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2010-06, Vol.356 (25), p.1252-1257
Main Authors: Zhang, L., Brow, R.K., Schlesinger, M.E., Ghussn, L., Zanotto, E.D.
Format: Article
Language:English
Subjects:
Air conditioning
Condensed matter: structure, mechanical and thermal properties
Disordered solids
Exact sciences and technology
Glass
Glass formation
Glass structure
Glasses
Iron
Iron phosphate glasses
Iron-rich phosphate
Melts
Phosphate glass
Phosphates
Physics
Quenching (cooling)
Raman spectroscopy
Structure of solids and liquids
crystallography
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Summary:Iron-rich phosphate glasses with nominal Fe/P ratios between 1.0 and 1.6 were prepared by a roller-quenching technique. The critical cooling rates (CCR) for glass formation were estimated by differential thermal analysis and found to be in the range of 10 3–10 4 °C/s for the iron-rich melts, compared to 1–10 °C/s for conventional iron phosphate melts with nominal Fe/P ratios near 0.50. The Fe(II)/Fe total fraction in the quenched glasses increases with melt time and temperature, and ranges between 0.30 and 0.55 for the glasses studied. Raman spectroscopy indicates that the structures of the iron-rich phosphate glasses are based on isolated orthophosphate tetrahedra, similar to what are found in α-FePO 4.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2010.04.019