Li添加ZnOの結晶構造に及ぼす水蒸気処理の影響

概要

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Effects of steam treatments on crystal structure of Li-doped ZnO were studied by X-ray diffraction measurement. X-ray diffraction patterns with bulk specimens obtained before and after the dielectric constant-temperature characteristics measurement and after the steam treatment were examined. The positions of all diffraction peaks are coincident with those obtained in ZnO and show that the crystal is wurtzite structure. However, depending on specimen treatment the discrepancies in the diffraction intensity distribution were observed. Especially, the (002)_ZnO diffraction intensity reflects the specimen treatments. X-ray diffraction patterns were also obtained for powder specimens, in which the preferred orientation in the constituent crystals was removed. Comparing the X-ray diffraction patterns obtained before and after the steam treatment, the (002)_ZnO diffraction intensity rose remarkably after the steam treatment. Applying the Rietveld pattern-fitting method to analyze the X-ray diffraction patterns, it was recognized that the parameters for the preferred orientation shift toward high-preferred orientation side. It is understood that the steam treatment induces preferred orientation of Li-doped ZnO.
函館工業高等専門学校の論文