摘要：采用高分辨透射电镜、场发射扫描电镜、傅里叶变换红外光谱、X射线粉晶衍射对淡水三角帆蚌养殖珍珠中生物文石的微结构特征及机械力研磨对文石晶体结构的影响进行研究。结果表明,珍珠粉制备过程中,随着研磨强度的增大,珍珠中的生物成因文石的红外光谱图中反对称伸缩振动谱带出现较明显的红移,谱图中的面外弯曲振动谱带同时出现蓝移;基于文石的热处理研究初步认为,机械力研磨过程中产生的热量是导致文石红外特征吸收峰发生频移的直接因素;机械力研磨初期,片层状珍珠粉颗粒逐渐分散并进一步微细化,随着研磨强度的增大,粉体颗粒进一步细化,但是因其表面能的增大而出现团聚。

关键词：珍珠粉；机械力化学作用；文石；频移

Abstract: HRTEM，FESEM，FTIR，XRD were employed to characterize the microstructure of biological aragonite in freshwater cultured pearls from Hyriopsis Cumingii shell and study the effect of mechanical treatment on the absorption bands of aragonite. The results show that during the preparation of pearl powders， with the increase of grinding intensity，the frequency of antisymmetric stretching vibration band of aragonite in pearl shows clearly red shift. The out plane bending vibration band shows blue shift. Based on the FTIR study on aragonite heated under different temperatures， the heat energy from the grinding process is accredited to the direct factor resulting in the frequency shift of absorption bands in aragonite. In the initial stage of mechanical treatment， lamellar pearl powders gradually disperse and refine further. With the increase of grinding intensity， the powders refine further but appear re-aggregation due to the high surface energy of active particles. 

Keywords: pearl powder； mechanochemical effect； aragonite； frequency shift