翡翠贻贝珍珠层的XRD和FTIR光谱特征

XRD and FTIR Spectra Characteristics of Nacreous Layer in Perna Viridis

对翡翠贻贝贝壳的珍珠层、棱柱层进行了XRD和FTIR光谱检测,对文石的1ν,2ν及4ν三个内振动模式的频率进行了分析。文石的1ν和4ν带在所有的样品中不存在频率位移现象,与洞穴文石的相关谱带的频率一致;ν2带频率却存在较大差异,珍珠层、棱柱层的2ν带存在频率位移,初步推测生物合成文石与热效应有关,内部储存有过剩的能量,可作为研究生物矿化机理的实验依据。

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.