某物质斑点花.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,例：某物质斑点花样如图，已知,L,=30.2,，测得如下：,A,H,B,G,D,E,C,F,O,OA=14.0mm,，,OB=23.2mm,，,OC=23.2mmOD=30.5mmOE=44.3mm,花样为平行四边形，任何晶系都可能,计算,d,值并整理数据。,斑点,R(mm,),R,i,2,/R,1,2,化整,hkl,hkl,或,A,14.0,1,4,200,200,200,B,23.2,2.75,11,131,131,113,C,23.2,2.75,11,131,D,30.5,4.75,19,331,331,313,E,44.3,10.01,40,062,062,026,（,1,）化整后可知为面心格子（立方晶系）,3,：,4,：,8,：,11,：,12,：,16,：,19,A,H,B,G,D,E,C,F,O,（,2,）设,A,指数为,200,，,B,为,131,，,则,D=331,，,符合倒易面上的指数规律。,用面角公式验算,计算,d,值并整理数据。,斑点,R(mm,),R,i,2,/R,1,2,化整,hkl,hkl,或,A,14.0,1,4,200,200,200,B,23.2,2.75,11,131,131,113,C,23.2,2.75,11,131,D,30.5,4.75,19,331,331,313,E,44.3,10.01,40,062,062,026,练习题,：,上,图是由某低碳合金钢薄膜样品的区域记录的单晶花样，,选,中心附近,A,、,B,、,C,、,D,四斑点，,测,得,R,A,7.1mm,，,R,B,10.0mm,，,R,C,12.3mm,，,R,D,21.5mm,，,同时用量角器测得,R,之间的夹角分别为,(R,A,R,B,),90,0,(R,A,R,C,),55,0,(R,A,R,D,),71,0,A,C,D,B,低碳合金钢基体的电子衍射花样,练习题,100KV L=800mm,获得,CaO,斑点为右。,二张图上斑点,R,如下：,斑点,R(mm,),A,10.69,A,12.33,B,17.43,B,20.41,C,20.41,A,B,C,B,A,