题目内容
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[主观题]
A specimen of nickel powder is studied by X—ray diffractometry.The sample is irradiated wi
th Cr Kα radiation,which has a wavelength,λ,of 2.29
.Only three diffraction peaks are observed in total:(111),(200),and(220).Explain why reflections from planes of higher Miller index are not observed. The lattice constant,a,for nickel is 3.53
.
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