3.2衍射产生的条件 3.2.1几何条件 2 sin0=元 n 2 dSin0=元 wheredn=d.The above equations express such a physical sense:the n order diffraction of any (hk/) lattice planes is equivalent to the first order diffraction of (nhnkn/)planes.For example,the second order diffraction of(100)planes is equivalent to the first order diffraction of(200)planes.3.2 衍射产生的条件 3.2.1 几何条件 where . The above equations express such a physical sense: the n order diffraction of any (hkl) lattice planes is equivalent to the first order diffraction of (nhnknl) planes. For example, the second order diffraction of (100) planes is equivalent to the first order diffraction of (200) planes. 2 sin   n dhkl 2dnhnknlsin   dhkl n  dnhnknl /