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用高角度线外推求点阵参数时,正确的外推直线的斜率永为正值。此斜率可以由衍射几何参数及样品条件算得。对此进行了实验验证。可以用外推斜率作为实际测量正确与否的一个判据。
When extrapolating a lattice parameter with a high-angle line, the correct slope of the extrapolated line is always positive. This slope can be calculated from the diffraction geometry and sample conditions. This experiment was verified. Extrapolation of the slope can be used as a criterion for the actual measurement of correctness or not.