【摘要】 对3种类型的文石即珍珠和贝壳珍珠层、珊瑚及天然无机文石的FTIR光谱进行了测量和对比分析。结果表明,珍珠和贝壳珍珠层文石的ν2频率平均值为863.6 cm-1,较珊瑚及天然无机文石存在明显的蓝移现象,蓝移值分别为7.9 cm-1和9.1 cm-1。珍珠和贝壳珍珠层文石这种异常的红外光谱频移特征可能与这类生物成因文石的低结晶度、纳米粒径及晶格畸变有关。更多还原

【Abstract】 The FTIR spectra of aragonites from different origins, which include aragonites from nacreous layers of pearls and bivalve shells, coral skeletons and natural inorganic aragonites, are measured and comparatively analyzed. The results show that the ν₂ vibrational frequency of aragonites from nacreous layer has the mean value of 863.6 cm^-1 which is about 7.9 cm^-1and 9.1 cm^-1, higher than that of aragonite from coral skeleton and natural inorganic aragonite respectively. The unusual characteristics of ν₂ vibrational frequency of aragonites from nacreous layer is probably resulted from the low crystallinity, crystal lattice distortion and nanometer size of aragonites.更多还原