1980—1981年,作者曾提出用修正指标化结合加权最小二乘拟合,利用X射线粉末图计算低对称晶胞参数的方法;在这篇文章中,作者又提出一个用叠代地修正测定值代替修正指标化的改进方法,来处理上述问题。该方法已用BASIC语言编写出程序,并在CROMEMCO—S—Ⅲ型微机上成功地运行。实践表明,改进的方法提高了测定精度,效果良好。 From 1980 to 1981, the authors proposed a method of using modified indexing combined with weighted least-squares fit to calculate low-symmetric unit cell parameters using X-ray powder images. In this article, the authors also proposed a method using iteratively modified assays Value instead of correcting the index of the improved method to deal with the above problems. This method has been programmed in BASIC and has been successfully run on a CROMEMCO-S-III microcomputer. Practice shows that the improved method improves the measurement accuracy and works well.