Physics Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Sep;113:15-21. doi: 10.1016/j.saa.2013.04.084. Epub 2013 May 3.
Glasses of various compositions in the system 90 Li2B4O7-10 Nb2O5 mixed with T.M ions (where T.M is the transition metal) were prepared by quenching technique. Heat-treatment of the parent glasses was performed at 540, 570 and 620 °C, for 5 and 16 h. The glass structure evolution during the controlled crystallization was examined by XRD and FT-IR spectroscopy analysis. The crystalline phases present in the glass ceramics were identified via X-ray diffraction as a function of heat treatment. The FT-IR data propose for these glasses and heat-treated glass network structures mainly built by: di-, tri-, tetra-, penta-and ortho-borate groups. It was found that the quantitative evolution of these various borate species in the glass structures is influenced by the transition metal. A detailed discussion relating to the N4 evolution with the T.M content was made.
采用淬火技术制备了系统 90Li2B4O7-10Nb2O5 与 T.M 离子（其中 T.M 是过渡金属）混合的各种成分的玻璃。对母玻璃进行 540、570 和 620°C 的热处理，时间为 5 和 16 小时。通过 XRD 和 FT-IR 光谱分析研究了受控结晶过程中的玻璃结构演变。通过 X 射线衍射确定了微晶玻璃中的晶相作为热处理的函数。FT-IR 数据表明，这些玻璃和热处理后的玻璃网络结构主要由：二、三、四、五和邻硼酸基团构成。发现这些各种硼酸盐物种在玻璃结构中的定量演变受过渡金属的影响。对 N4 随 T.M 含量的演变进行了详细讨论。
