在文献中看到分析Cu2时有这样一段话： The strong and sharp peaks indicate that the obtained Cu2Ocrystals are highly crystalline.Meanwhile, we observe that the intensity ratio between the (111)and (200) diffraction peaks is lower than the ratio of those peaks in the standard powder pattern (1.4 versus 2.7) for cubes,whereas the value (3.05) for octahedra is higher. These results indicate that cubes are abundant in {100} facets, whereas {111} facets should dominate octahedra. XRD图见附件 请问：XRD中表明的不就是表示的某一晶面吗！{100}晶面族是如何确定的呢？可不可以写出{110}呢？
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