摘要
本文借助于磷灰石的晶体结构资料,用位置群分析的方法,讨论了碳氟磷灰石的晶体结构与它的红外光谱间的关系,并从位置群的角度分析了CO_3^(2-)的存在形式及可能的位置对称。
The present paper discusses the relationship between infrared spectra and crystal structure of cabonate-fluorapatite.When PO43- ions symmetrically occupy Cs site,the vibration of PO43- ions is marked by A' (v1) , A' + Ay (v2)and 2A' + A' (v3, v4). There are nine vibration frequencies on the infrared spectrogram. CO32- substitutes PO43- ions, with two possible site symmetries, respectively Cs h (σh)and Csv(σh). In this case,the v3 and v4 vibrations of CO32- ions generate split of site group,and v1 becomes infrared active. The reason why vibration of CO32- ions is featured by two peaks has been explained well.
关键词
碳氟磷石
位置群
分析
carbonate-fluorapatitc, site group analysis,infrared spectra
