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자료유형
학술저널
저자정보
Poom Prayoonphokkharat (Chiang Mai University) Penphitcha Amonpattaratkit (Synchrotron Light Research Institute) Anucha Watcharapasorn (Chiang Mai University)
저널정보
대한금속·재료학회 Electronic Materials Letters Electronic Materials Letters Vol.15 No.3
발행연도
2019.1
수록면
377 - 382 (6page)

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In this research, the processing and characterization of (Y 1−x Pr x ) 1+ δ Ba 2− δ Cu 3 O 7−y cuprate perovskite powder were studied. The experimental powder samples of (Y 1−x Pr x ) 1+ δ Ba 2− δ Cu 3 O 7−y (0 ≤ x ≤ 1) were prepared using a conventional solid-statereaction method. The starting powders in appropriate ratios were mixed with 6 mol% excess of A-site ions to reduce theamount of BaCuO 2 and PrBaO 3 second phases and calcined at 880 °C for 12 h in normal atmosphere. The calcined powderswere investigated for phase content using X-ray diff raction technique and detailed structural parameters were obtained byRietveld refi nement. The microstructure of the powders was investigated by scanning electron microscopy (SEM). The chemicalcomposition was carried out by energy dispersive X-ray analysis (EDS). The oxidation state and coordination of Pr and Cuwere determined by X-ray absorption near edge structure (XANES) spectroscopy. It was found that high-purity (Y,Pr)BCOpowders could be obtained. By the Rietveld refi nement, the overall unit cell volume increased with increasing Pr content. SEM–EDS images showed that the particle size was about 1–5 μm and the elemental composition of (Y + Pr):Ba:Cu = 1:2:3. Pr and Cu XANES spectra indicated that the average formal valence was larger than 3 for Pr and 2 for Cu. However, the peakshifted to lower valence state at higher concentration of Pr.

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