利用水热法实验制备黄钾铁矾固溶系列样品AFe3(SO4)2(OH)6,其中A位置可以被K+、Na+和H3O+占据。此外,还制备近全钾占据的黄钾铁矾作为对比样品。对制备的黄钾铁矾群样品进行了拉曼光谱测试,黄钾铁矾的拉曼光谱分为羟基区(3000~4000 cm-1)、硫酸根内部模式、点阵振动模三个主要部分,并对有异议的振动模的归属重新做了分析。利用拉曼光谱峰的数目以及频移,离子半径的大小、键长、键角的变化等信息,采用胡克定律分析了黄钾铁矾固溶系列A位置的离子替换作用。A位置离子的替换作用主要影响黄钾铁矾结构中OH基周围的环境,使得与羟基相关的振动模发生变化。

In this paper,the solid-solution series of the jarosite group AFe3(SO4)2(OH)6 have been synthesized,where the site of A can be occupied by K+,Na+ and H3O+.In addition,nearly fully occupied potassium jarosite is prepared for comparison.Raman spectra of the jarosite group are measured and analysized.The jarosite group minerals can be characterized by Raman spectra and the bonds can be due to the hydroxyl groups,internal modes of sulfate and lattice modes.Some bonds assignment which are open to question are analysized.According to the number of the scattered peaks and frequencies,the size of the ionic radius,bonds length and bonds angle,the effect of the substitutions of ions in A-site of jarosite solid solution series is analysized by hooke's law.The substitution effect of A position ion mainly affect the OH in the jarosite and the hydroxyl vibration mode.