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富镁与贫镁坡缕石的红外光谱

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Abstract:

研究了安徽明光富镁坡缕石和江苏盱眙贫镁坡缕石及其热处理产物的红外光谱特征(尤其是中低频区域),结果表明坡缕石的红外光谱特征峰为1196cm–1(连接倒转SiO4四面体的Si—O—Si非对称伸缩振动),647cm–1(与孔道边缘MgO6八面体配位的结晶水相关的H2O—Mg—OH2振动)。由于八面体中阳离子占位差异,垂直的Si—O—M(Ⅵ)非对称伸缩振动与对称伸缩振动峰在盱眙贫镁坡缕石中分别出现在998cm–1和685cm–1,明光富镁坡缕石中则分别显示为987cm–1和680cm–1,而且富镁的坡缕石一般出现特征峰3687cm–1(Mg3—OH伸缩振动)。此外,明光富镁坡缕石样品中存在的865cm–1峰应为杂质无定形碳酸盐的CO32–弯曲振动。

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