Determination of microfibril angle distribution by X-ray diffraction
Determination of microfibril angle distribution by X-ray diffraction
复制标题
X 射线衍射测定微纤维角度分布
DOI：
10.1007/s00226-005-0052-7
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发表时间：
2006
影响因子：
3.4
通讯作者：
R. Serimaa
中科院分区：
文献类型：
--
作者：
M. Sarén;R. Serimaa
X射线衍射法是一种成熟的测定平均微纤丝角(MFA)的方法。当样本是一片木材时，纤维方向、细胞形状和测量几何形状的变化会影响强度曲线。导出了以描述纤维取向和晶胞形状的角度表示的衍射条件的一般形式。用蒙特卡罗方法计算了强度曲线，并与实验值进行了比较。用峰值拟合法和方差法从强度曲线确定平均MFA。以挪威云杉为例。结果表明，当采用对称的传输几何结构时，纤维取向的偏差，即螺旋颗粒，对平均MFA没有明显的影响。当采用垂直传输几何时，螺旋颗粒或尖端的大偏差往往会增加方差法测定的MFA，而降低拟合法测定的MFA。当使用反射200和拟合方法时，应考虑单元的形状。方差法对细胞的形状不敏感。
X-ray diffraction is a well-established method for the determination of the mean microfibril angle (MFA). When the sample is a slice of wood variations in the fibre orientation, the shape of the cells, and the measurement geometry affect the intensity curve. A general form for diffraction conditions in terms of angles describing the fibre orientation and the shape of the cell was derived. Intensity curves were calculated by using Monte Carlo method and compared with experimental ones. Both peak fitting and variance methods were used for determining the mean MFA from the intensity curves. Norway spruce was used as an example. Results indicate that deviations in the fibre orientation, the spiral grain, do not affect the mean MFA considerably when using the symmetrical transmission geometry. When using the perpendicular transmission geometry large deviations in spiral grain or tips tend to increase the MFA determined with the variance method and decrease the MFA determined with the fitting method. The shape of the cell should be considered when using the reflection 200 and the fitting method. The variance method is insensitive to the shape of the cell.
影响因子：
15
作者：
Nishiyama, Y;Langan, P;Chanzy, H
通讯作者：
Chanzy, H