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.
. 1980, 碳氟磷灰石的红外吸收光谱. 地质科学, 15(2): 156-166.
. THE INFRARED ABSORPTION SPECTRA OF CARBON-FLUORAPATITE[J]. Chinese Journal of Geology, 1980, 15(2): 156-166.