...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Elucidation of the crystal structure of oxyapatite by high-resolution electron microscopy
【24h】

Elucidation of the crystal structure of oxyapatite by high-resolution electron microscopy

机译：高分辨率电子显微镜阐明羟磷灰石的晶体结构

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

High-resolution electron-microscopy (HREM) images from different hydroxyapatite (OHAp) samples showed p3 projection symmetry along [001] instead of the p6 projection symmetry compatible with the space group P6(3)/m of OHAp. Image processing was used to establish without ambiguity that threefold symmetry dominates the images along [001]. OHAp crystals decompose in the transmission electron microscope and it is concluded that the threefold symmetry observed corresponds to an early step in the decomposition process, the dehydration of OHAp to oxyapatite (OAp). A structural model for OAp where every second O atom along the 6(3) axis in OHAp is removed has the maximal space-group symmetry . This is compatible with the p3 projection symmetry observed. Atomic shifts in this OAp model compared to the OHAp structure were estimated using the HREM images and geometric optimizations of the atomic structure. No refinements of the atomic coordinates against diffraction data were possible but the simulated HREM images of this crude model fit well with the experimental images. [References: 24]
机译：来自不同羟基磷灰石（OHAp）样品的高分辨率电子显微镜（HREM）图像显示沿[001]的p3投影对称性，而不是与OHAp空间群P6（3）/ m兼容的p6投影对称性。图像处理用于毫无疑问地确定三重对称控制着[001]图像。 OHAp晶体在透射电子显微镜中分解，得出的结论是，三重对称性对应于分解过程的早期阶段，即OHAp脱水为羟磷灰石（OAp）。 OAp的结构模型（沿着OHAp中的6（3）轴每隔两个O原子被去除）具有最大的空间组对称性。这与观察到的p3投影对称性兼容。与OHAp结构相比，此OAp模型中的原子位移是使用HREM图像和原子结构的几何优化估算的。不可能对衍射数据进行原子坐标的细化，但是该粗模型的模拟HREM图像与实验图像非常吻合。 [参考：24]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号