| 碳氟磷灰石的红外吸收光谱 |
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| 引用本文： | 韩秀伶. 碳氟磷灰石的红外吸收光谱[J]. 地质科学,1980,15(2): 156-166. |
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| 作者姓名： | 韩秀伶 |
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| 摘 要： | 众所周知,磷灰石族矿物是很复杂的一族矿物,在磷灰石结构内可以有多种类质同象置换,而其基本结构并无重大改变,因而它的结晶学的研究是一项复杂的任务。至今,对磷灰石的结晶学问题了解得还不很清楚,在沉积岩中分布最广、颗粒细小而又具经济价值的碳氟磷灰石所引起的争论最为激烈,关于磷灰石中(CO3)2-离子的存在形式,是长期以来进行争论的问题。本文主要就作者所做磷灰石的红外吸收光谱工作,并引用晶胞常数和化学分析数据,对此问题进行讨论。
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THE INFRARED ABSORPTION SPECTRA OF CARBON-FLUORAPATITE |
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| Han Xiuling. THE INFRARED ABSORPTION SPECTRA OF CARBON-FLUORAPATITE[J]. Chinese Journal of Geology,1980,15(2): 156-166. |
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| Authors: | Han Xiuling |
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| Abstract: | From the data on infrared absorption spectra of carbon-fluorapatite this paper discusses the existing form of (CO3)2- in apatite Basing upon the difference of absorption bands of the ion (CO3)2- in the corbon-fluorapatite from that in carbonate, the regularly slight changes of ion (PO4)3- bands with the increase of content of CO2% in apatite, the band position of (PO4)3- in carbon-fluor-apatite, its relative strength and pattern independent of the influence of both calcite or dolomite mixed by chance, and the close agreement of a lot of spectra of phosphorite samples with those of above-mentioned mixtures and so on, the author come to a preliminary conclusion that ions (CO3)2- in apatite and carbonates are in different structural environment, so that ion (CO3)2- in carbon-fluorapatite was entered into the structure of apatite and closely associated with the ion (PO4)3-, Consequently, the infrared absorption spectra can be used to evaluate the existing form of (CO3)2- in apatite, identify carbon-fluorapatite and determine the kinds and amount of carbonates in phosphorite.The decrease of of and P2O5% in apatite with increasing of content of CO2% and the unregular change of P further confirm that (CO3)2- enters into structure of apatite and that (PO4)3- rather than F- is probably replaced by (CO3)2-.At the end of this paper the semi-quantitative method of determination of content CO2 in apatite structure by infrared spectra is also reported herein. |
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