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ＥＸＡＦＳ研究ＦｅＣｌ３溶液中Ｆｅ３＋的区域环境结构随溶液浓度的变化，Ｆｅ３＋的径向结构函数表明，随着ＦｅＣｌ３溶液的浓度降低，第一配位峰的距离逐渐缩短。当溶液浓度从３．０ｍｏｌ／Ｌ降到０．２ｍｏｌ／Ｌ时，配位距离减小０．０１４ｎｍ，但振幅峰强度以０．８ｍｏｌ／Ｌ浓度为最小，其强度比浓的或稀的ＦｅＣｌ３溶液的低约３０％。结构参数拟合结果表明，０．２ｍｏｌ／ＬＦｅＣｌ３稀溶液中Ｆｅ３＋的近邻配位为６个Ｈ２Ｏ的Ｏ原子形成正八面体配位；３．０ｍｏｌ／ＬＦｅＣｌ３溶液中Ｆｅ３＋的近邻配位为２个Ｃｌ－和４个Ｈ２Ｏ中的Ｏ原子。０．８ｍｏｌ／ＬＦｅＣｌ３溶液中Ｆｅ３＋的近邻配位有１个Ｃｌ－和５个Ｏ原子，其结构无序相对较大，是Ｃｌ－与Ｏ组成的扭曲八面体配位。
EXAFS study of FeCl3 solution Fe3 + regional environmental structure with the solution concentration changes, the radial structure of Fe3 + shows that as the FeCl3 solution concentration decreases, the first coordination peak distance gradually reduced. When the solution concentration decreased from 3.0mol / L to 0.2mol / L, the coordination distance decreased by 0.014nm, but the amplitude peak intensity was the lowest at 0.8mol / L, and the intensity was stronger than that of concentrated or diluted FeCl3 About 30% lower solution. The fitting results of structural parameters show that the nearest neighbor coordination of Fe3 + in 0.2mol / L FeCl3 solution is the octahedron coordination of O atom of 6 H2O. The coordination of Fe3 + in 3.0mol / L FeCl3 solution is two Cl- And O atoms in 4 H2O. The nearest neighbor of Fe3 + in 0.8mol / L FeCl3 solution has one Cl- and five O atoms, and its structure is relatively unordered. It is a twisted octahedron composed of Cl- and O.