定义倒易点阵 ·定义倒易点阵的基本矢量垂直于正点阵异名矢量构成的平面 b× C×C a×b b 所以有:c"·C=a·a=b·b=1 b C·C b·C=c"a=c·b=0 (仅当正交晶系)a=-,b=1,c C定义倒易点阵 • 定义倒易点阵的基本矢量垂直于正点阵异名矢量构成的平面 • 所以有: • (仅当正交晶系) V a b c V c a b V b c a = = = = = = = = = 0 a b a c b a b c c a c b = = = 1 c c a a b b c c b b a a 1 1 1 = = = , ,