Characterization of inorganic and biogenic magnesian calcites by Fourier Transform infrared spectroscopy

被引:91
作者
Bottcher, ME
Gehlken, PL
Steele, DF
机构
[1] Univ Oldenburg, Inst Chem & Biol Marine Environm ICBM, D-26111 Oldenburg, Germany
[2] Dr Peer L Gehlken Testing Raw & Residual Mineral, D-37308 Heiligenstadt, Germany
[3] Univ Liverpool, Dept Earth Sci, Liverpool L69 3BX, Merseyside, England
关键词
solid solution; cationic substitution; FTIR spectroscopy;
D O I
10.1016/S0167-2738(97)00235-X
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The effect of cationic substitution on the mid-infrared absorption spectra of synthetic, and natural inorganic and biogenic MgCO3-CaCO3 solid solutions (Mg calcites; space group R(3) over barc$; 0-23 mol% MgCO3) is investigated, and the results are compared to disordered proto-dolomite (Ca0.5Mg0.5CO3; space group R(3) over barc$), ordered dolomite (Ca0.5Mg0.5CO3; space group <R(3)over bar>), huntite (Ca0.25Mg0.75CO3; space group R32), and magnesite (MgCO3; space group R(3) over barc$). The measurements show that significant frequency shifts of the vibrational bands of the carbonate ion group occur as a function of chemical composition. The Mg2+ content of all Mg calcites correlates linearly with the position of the sharp nu 4 mode according to: nu 4 (cm(-1)) = 39.40X(Mg) + 712.20 (r = 0.97).
引用
收藏
页码:1379 / 1385
页数:7
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