| 光谱学与光谱分析 |
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| XRD and FTIR Spectra Characteristics of Nacreous Layer in Perna Viridis |
| JIA Tai-xuan1,2,LIU Zi-li1,2*,ZHANG Gang-sheng1 |
1. College of Chemistry & Chemical Engineering, Guangxi University, Nanning 530004, China
2. College of Chemistry & Chemical Engineering, Guangzhou University, Guangzhou 510006, China |
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Abstract The XRD and FTIR of aragonites in nacreous and prismatic layer of perna viridis were systematically measured, and the frequency variations of ν1,ν2 and ν4 band of aragonites were especially analyzed. The results showed that both of them were aragonite and the frequency of ν2 band differed in them, but the frequencies of other two bands were not altered and had the same values with cavernous aragonite. In the same specie of shell, the frequency of ν2 band in nacreous layers was greater than that in prismatic layers, and there was a frequency shift of ν2 band between them. For the first time, the phase transformation of biogenic aragonite was detected. After nacreous aragonite was heated at 300 ℃, the frequency shift of ν2 band was found. So it is concluded that the biogenic aragonite is related to the thermal effects in crystallizing process, meanwhile it stores excess energy. All of these can provide experiential basis for studying biomineralization theory.
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Received: 2007-09-06
Accepted: 2007-12-16
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Corresponding Authors:
LIU Zi-li
E-mail: gzdxlzl@163.com
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