کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5376508 | 1504326 | 2007 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Chromium substitution effects in Y-124 superconductor prepared by aqueous sol-gel method
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Superconducting YBa2(Cu1âx Crx)4O8 (x = 0.01; 0.03; 0.05; 0.10; 0.20) oxides have been synthesized by the aqueous sol-gel method. Effects of chromium substitutions on the properties of compounds were studied by resistivity measurements, X-ray powder diffraction, infrared spectroscopy, electron microscopy and elemental analysis. These data indicated that doping with chromium has a strong effect on the superconducting properties of YBa2Cu4O8 (Y-124) phase. It was demonstrated, that the YBa2(Cu1âxCrx)4O8 samples with x = 0.01, 0.03, 0.05 and 0.10 are superconducting, and the sample with x = 0.20 is not superconducting anymore. Elemental analysis data clearly indicated that Cr enters the Cu sites in the both, Cr3+ and Cr6+ oxidation states. The point defect chemistry approach, which explains the changes of TC by substituting chromium for copper in the YBa2Cu4O8 superconductor, is presented.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 332, Issues 2â3, 14 February 2007, Pages 225-231
Journal: Chemical Physics - Volume 332, Issues 2â3, 14 February 2007, Pages 225-231
نویسندگان
Giedre Nenartaviciene, Aldona Beganskiene, Stasys Tautkus, Darius Jasaitis, Aivaras Kareiva,