加热白云母的穆斯堡尔效应及光学吸收光谱的研究

近年来,层状硅酸盐加热后氧化态的变化以及阳离子在各晶位的迁移引起了人们的兴趣,由于穆斯堡尔效应和光学吸收光谱是测定铁以及某些过渡族离子的氧化状态变化及位置分布的最有效的方法,因此,一些研究主要集中在黑云母等层状硅酸盐的穆斯堡尔效应和光学吸收光谱的研究上(Tripathi et al.,1978;Hogg et al.,1975)。

A STUDY ON MÕSSBAUER EFFECT AND OP TICAL ABSORPTION SPECTRA OF HEATED MUSCOVITES

Mossbauer effect and optical absorption spectra were used to study the muscovites and its heated products. It is shown by the results that Fe²⁺ ions are arranged orderly in M2 crystal site of the muscovites at room temperature,while Fe²⁺ ions are oxidized to Fe3+ ions and arranged disorderly in M2 and Ml sites after heating. The pleochroism and color of the muscovites and heated muscovites are explained based on Mossbauer spectra and optical absorption spectra.