From synthetic to biogenic Mg-containing calcites: a comparative study   using FTIR microspectroscopy

doi:10.1039/c2cp22453d

CORC > 北京大学 > 化学与分子工程学院

	From synthetic to biogenic Mg-containing calcites: a comparative study using FTIR microspectroscopy
	Long, Xia ; Nasse, Michael J. ; Ma, Yurong ; Qi, Limin
刊名	physical chemistry chemical physics
	2012
关键词	SEA-URCHIN TEETH MAGNESIUM-CALCITE INFRARED MICROSPECTROSCOPY CARBONATE MINERALS PRECURSOR PHASE IN-VITRO BIOMINERALIZATION SPECTROSCOPY SPECTRA ORIENTATION
DOI	10.1039/c2cp22453d
英文摘要	The formation mechanism of the thermodynamically unstable calcite phase, very high Mg calcite, in biological organisms such as sea urchin or corallina algae has been an enigma for a very long time. In contrast to conventional methods such as KBr pellet Fourier Transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD), FTIR microspectroscopy (FTIRM) provides additional information about a local disorder such as an amorphous phase or the occlusion of Mg ions in the calcite lattice. In this work, we characterise for the first time systematically synthetic and biogenic Mg-containing calcium carbonate samples (especially sea urchin teeth-SUT) in detail by using two FTIRM instruments and compare these samples with KBr pellet FTIR measurements. Furthermore, we present spectra from geogenic calcite and dolomite minerals, recorded with both FTIRM systems, as well as KBr pellet FTIR spectra as references. We analyse the spectra by applying multi-peak curve fitting on the in-plane-bending (nu(4)) and out-of-plane (nu(2)) bands. Based on the obtained results we attribute the two singlet bands at similar to 860-865 cm(-1) and similar to 695-704 cm(-1) observed in the SUT FTIRM spectra to the existence of amorphous calcium carbonate (ACC), and report for the first time the existence of ACC at the mature end of SUT. In the other three studied biominerals, however, we did not find any ACC. Also, based on the FTIRM results, we observe that not only nu(4), but also nu(2) shifts to higher wavenumbers if more calcium ions are replaced by magnesium ions in the calcite lattices.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000299505400018&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Chemistry, Physical; Physics, Atomic, Molecular & Chemical; SCI(E); PubMed; 12; ARTICLE; 7; 2255-2263; 14
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/191857]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Long, Xia,Nasse, Michael J.,Ma, Yurong,et al. From synthetic to biogenic Mg-containing calcites: a comparative study using FTIR microspectroscopy[J]. physical chemistry chemical physics,2012.
APA	Long, Xia,Nasse, Michael J.,Ma, Yurong,&Qi, Limin.(2012).From synthetic to biogenic Mg-containing calcites: a comparative study using FTIR microspectroscopy.physical chemistry chemical physics.
MLA	Long, Xia,et al."From synthetic to biogenic Mg-containing calcites: a comparative study using FTIR microspectroscopy".physical chemistry chemical physics (2012).