天然文石质陶瓷-三角帆蚌贝壳的FTIR光谱研究

三角帆蚌贝壳珍珠层及韧带经粉末XRD分析证实均由文石组成。对珍珠层及韧带的FTIR光谱进行了测量和对比分析。结果表明：(1)文石的ν₂,ν₃带显示了较大的变化，相对韧带而言，珍珠层文石的ν₂带频率蓝移6.5 cm-1,而ν₃带却红移22.7 cm-1;(2)珍珠层文石的ν₂,ν₃带半高宽分别比韧带文石宽1倍左右。相比之下，珍珠层及韧带文石的ν₁,ν₄带的特征基本没有发生变化。文石红外光谱的这种各向异性的变化可能是由文石的粒径效应引起的。

FTIR Spectroscopic Study on Natural Aragonitic Ceramics-Bivalve Shells of Hyriopsis Cumingii

The two shell layers, i. e. , the ligament (HCL) and the inner nacreous layers (HCN) from bivalve shells of Hyriopsis cumingii, both composed of aragonite by powder XRD analysis, w ere comparatively analyzed by FT IR spectrometry. The results show that: (1) the features of vz and v3 bands of aragonite are clearly different between the two shell layers, as the v2 band of HCN aragonite shows a 6. 5 cm(-1) blue-shift, but the vs band shows a 22. 7 cm(-1) red-shift compared to that of HCL aragonite; (2) the full width at half maximum of v1 and v3 bands of HCN aragonite is nearly doubled compared to that of HCL aragonite; (3) however, the features of v1 and v4 bands are independent on shell layers. It is suggested that the anisotropic frequency shifts of the aragonite in HCN and HCL perhaps result from the size effects of aragonite crystals.