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Glass formation from iron-rich phosphate melts

机译:由富铁磷酸盐熔体形成的玻璃

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摘要

Iron-rich phosphate glasses with nominal Fe/P ratios between 1.0 and 1.6 were prepared by a rollerquenching 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 theglasses 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.
机译:通过辊淬技术制备了标称Fe / P比在1.0和1.6之间的富铁磷酸盐玻璃。通过差热分析估算了玻璃形成的临界冷却速率(CCR),发现富铁熔体的临界冷却速率为10〜3-10〜4°C / s,而1-10°C /对于标称Fe / P比接近0.50的常规​​磷酸铁熔体,其s为s。淬火玻璃中的Fe(II)/ Fe_(总)分数随熔化时间和温度的增加而增加,所研究的玻璃的范围在0.30至0.55之间。拉曼光谱表明,富铁磷酸盐玻璃的结构基于分离的正磷酸盐四面体,类似于在α-FePO_4中发现的结构。

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