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miller indices drugs crystal structures x-ray diffraction semiconductor extrinsic semiconductor intrinsic semiconductor molecular structure nanomaterials carbon nanotubes fullurene junction bipolar transistors 賰賮丕賱丞 丕賱賷鬲賷賲 close pack structure solid state semiconductor materials 丕賱賲賳亘賴丕鬲 貙丕賱賲爻賴乇丕鬲 貙丕賱氐丨丞 crystallographic planes