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3、=1.633a21r 6120.74MgZnBeCdBCCFCCHCPFCCa=b=c,=90o2868%BCCa=b=c,=90041274%HCPa=bc,c/a=1. 633,=90o,=120oa/261274%31hklXYZ1,1,0,010012311/21/3(632)2211/21/211,1,2XYZ33(hkl)110110110101101011011XZY111111111111XZY-110110XZY(221)(110)(111)+1a. b.()?= S/V(cm/cm31/cm2)1041012/cm2-()c. 5102040102 )2(1)D=Doexp(-Q/RTDo:(cm2/s),QDoQ10-15D(2)(3)