Phase relations of the nepheline-kalsilite system: X-ray diffraction and Mossbauer spectroscopy
Phase relations of the nepheline-kalsilite system: X-ray diffraction and Mossbauer spectroscopy
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霞石-方钾硅石系统的相关系：X 射线衍射和穆斯堡尔光谱
DOI：
10.1016/j.jallcom.2017.04.164
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发表时间：
2017
影响因子：
6.2
通讯作者：
Wu X
中科院分区：
文献类型：
--
作者：
Wu Ye;Wu Xiang;Tu Bingtian;Wu X
霞石-六方钾霞石（NaAlSiO 4-KAlSiO 4）系统中的结晶溶液是一类重要的造岩构造硅酸盐，在材料科学和地质学领域具有重要的应用价值。对霞石-六方钾霞石体系相关系的研究表明，Fe ~（3+）取代Al ~（3+）10mol%不影响固溶体的相关系，但使晶格常数增大。穆斯堡尔谱分析表明，在Na（Al0.9Fe0.1）SiO 4-K（Al0.9Fe0.1）SiO 4体系中，低温光镁铝石、低温霞石和正交晶系KAlSiO 4 O 1相只有一个四面体配位的高自旋Fe 3+的双峰，即掺杂的Fe 3+占据Al 3+位置，与周围的氧原子形成四面体，这是基于电荷平衡的结果。
The crystalline solutions in the nepheline-kalsilite (NaAlSiO4-KAlSiO4) system form an important group rock-forming tectosilicates, which have significant applications for materials science and implications for the geology field. The present studies on phase relations of the Fe-free and Fe-bearing nepheline-kalsilite systems have demonstrated that 10 mol % of Fe3+substitution in Al3+does not affect the phase relations of the solid solutions but causes the increase of lattice parameters. Analysis of the Mössbauer spectra has indicated that low-temperature carnegieite, low-temperature nepheline, and orthorhombic KAlSiO4O1 phases in the Na(Al0.9Fe0.1)SiO4-K(Al0.9Fe0.1)SiO4system only have one doublet assigned to high-spin Fe3+with tetrahedral coordination, which means the doped Fe3+cations occupy the Al3+sites forming tetrahedrons with surrounding oxygen atoms based on charge balance.