解释XRD谱图中最后两个晶面峰值重叠如NaCl的XRD图谱中两个晶面333,511峰值重叠,

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Overlap may be exact because of the equivalence of reflection d-spacings or accidental resulting from near-equivalence d-spacings that are separated from one another by an amount less than the resolving powder of the instrument.
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