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采用X射线衍射采集海水鲈鱼鳞片中羟基磷灰石(002)、(130)、(211)面网和鳍骨中羟基磷灰石(031)、(120)、(132)面网极图数据并计算了取向分布函数(ODF)以分析其择优取向特征,其中鳞片极图数据显示出羟基磷灰石结晶学c轴主要有3个择优取向,分别是与鳞片法线方向平行、相交39°和相交63°,而鳍骨极图推测出其羟基磷灰石c轴择优取向大致有五个方向,分别与鳍骨截面法线相交3°、9°、17°、24°和36°.ODF的计算结果表明,鳞片中羟基磷灰石有比较明显的择优取向是结晶学c轴近似平行于鳞片表面,同样,鳍骨ODF中羟基磷灰石择优取向为结晶学c轴近垂直于截面.极图和ODF结果上的差别是由于极图本身是晶体取向的二维投影图,单张极图显示的择优信息不够完整,因此ODF用来解析生物矿物的择优取向特征更为准确.鳞片和鳍骨中羟基磷灰石结构中的择优取向现象是因为生物矿化过程中有机质的调控作用而使结晶学c轴趋向平行胶原纤维长轴方向,并且这种择优特征也是硬体组织具有优良力学性能的要求.
X-ray diffraction was used to collect the polarographic data of hydroxyapatite (002), (130), (211), and hydroxyapatite (031), (120) and (132) The orientation distribution function (ODF) was calculated to analyze its preferred orientation characteristics. The polarographic data showed that the crystallographic c-axis of hydroxyapatite had three preferred orientations, which were parallel to the normal direction of the scales and intersected by 39 ° And intersects 63 °, while the polar diagram of fins shows that the preferred orientation of c-axis of hydroxyapatite is roughly in five directions, which intersect 3 °, 9 °, 17 °, 24 ° and 36 ° with the normal section of the fins. The results of ODF show that the preferred orientation of hydroxyapatite in scales is that the crystallographic c-axis is approximately parallel to the scale surface. Likewise, the preferred orientation of hydroxyapatite in the ODF of the fins is that the crystallographic c-axis is nearly perpendicular to the cross-section The difference between the pole figure and the ODF result is that the pole figure itself is a two-dimensional projection of the crystal orientation, and the single-pole figure shows the incomplete information, so the ODF is more accurate for analyzing the preferred orientation characteristics of the bio-minerals. And the preferred orientation in the hydroxyapatite structure in the fins is due to biomineralization The role of the regulation of organic matter in the process makes the crystallographic c-axis direction parallel to the long axis of the collagen fibers, and this preferred feature is also a requirement of the hard tissue with good mechanical properties.