贝壳中文石晶体择优取向的XRD分析

Analysis of Preferential Orientation of Aragonite Crystals in Nacre Based on XRD

贝壳珍珠层独特的结构是其优异力学性能的重要原因.采用X射线衍射法(XRD)对贝壳珍珠层及柱状晶的晶体结构及择优取向进行了详细的探讨.结果表明:珍珠层中文石晶体在沿珍珠层面上存在两种定向排列,即(002)和(012),具有择优取向性,柱状晶层结构的无序性比珍珠层大.

The unique microstructure of nacre is considered to be the most important reason responsible for high mechanical performance of nacre. Based on the X-Ray diffraction analysis, the preferential orientations of aragonite crystals in nacre and in prismatic layer are systematically studied. It shows that there exist two kinds of orientation in nacre, （002） and （012） nets of aragonite lattice are parallel to nacreous layers. The microstructure of prismatic layer is more unorderly than that of nacre.