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本文提出一个从粉末图测定低对称造岩矿物晶胞参数的计算方法。它适合以衍射仪,纪尼叶照相法,直径为57.mm的德拜照相法等各种方法所取得的粉末图。其方法实质上是加权最小二乘拟合与叠代修正指标化的技巧相结合的平滑过程。已编好两份Algol-6语言的程序,均在709机上调试通过,算出正确结果。对方法稍加简化,又得到了可以在台式电算机上进行手算的简化方案。用此法测定了单斜辉石、碱性长石、斜长石及三元长石的晶胞参数。精度在10~(-3)—5×10~(-4)之间(相对误差)。
In this paper, a method of calculating the unit cell parameters of low-symmetry rock-forming minerals from the powder map is proposed. It is suitable for powder images obtained by various methods such as diffractometer, Sonyev method, Debye method with a diameter of 57 mm. The method is essentially a combination of the weighted least-squares fitting and the iteratively modified indexing technique. Have compiled two Algol-6 language program, are on the 709 machine debugging, calculate the correct result. Simplifying the method and getting a simplified solution that can be done manually on a desktop computer. The unit cell parameters of clinopyroxene, alkaline feldspar, plagioclase and ternary feldspar were determined by this method. Accuracy of 10 ~ (-3) -5 × 10 -4 (relative error).