The atomic structure of a series of sodium iron phosphate glasses is studied using different experimental techniques: X‐ray and neutron diffraction (ND), infrared spectroscopy, extended X‐ray absorption fine structure (EXAFS), and X‐ray absorption near‐edge structure (XANES). Detailed information about the atomic pair correlations is obtained. The high resolution of ND in real space resolves two P–O distances at 1.48 Ǻ and 1.59 Ǻ as expected. All the glasses are found to consist of a phosphate tetrahedral network with metaphosphate chains and pyrophosphate units, and every phosphate unit is found to have two or three nonbridging oxygen (NBO) links available to coordinate with Na and Fe cations. The Fe–O coordination number in these glasses is found to decrease from 5.7 to 4.8 with increasing the Fe content, whereas the Na coordination number of approximately 5 is detected for all the samples.

中文翻译：

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磷酸钠铁玻璃的原子结构

使用不同的实验技术研究了一系列磷酸钠铁玻璃的原子结构：X射线和中子衍射（ND），红外光谱，扩展的X射线吸收精细结构（EXAFS）和近边缘的X射线吸收结构（XANES）。获得有关原子对相关性的详细信息。ND在实际空间中的高分辨率可以按预期解析出两个P–O距离，分别为1.48 1.5和1.59Ǻ。发现所有玻璃均由具有偏磷酸盐链和焦磷酸盐单元的磷酸盐四面体网络组成，并且发现每个磷酸盐单元都具有两个或三个可与Na和Fe阳离子配位的非桥接氧（NBO）连接。发现随着铁含量的增加，这些玻璃中的Fe-O配位数从5.7降低至4.8，