Doping of Nb to the Ba and Cu Sites in the Y0.6Gd0.4Ba2Cu3O7−δ期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Doping of Nb to the Ba and Cu Sites in the Y0.6Gd0.4Ba2Cu3O7−δ

Authors:	M Yılmaz E Sönmez O Doğan

Affiliation:	1. Department of Physics, A. Kele?o?lu Education Faculty, Sel?uk University, 42099, Meram-Konya, Turkey 2. Department of Physics, K.K. Education Faculty, Ataturk University, 25240, Yakutiye-Erzurum, Turkey 3. Advanced Materials Research Laboratory, Department of Nanoscience & Nanoengineering, Graduate School of Natural and Applied Sciences, Atatürk University, 25240, Erzurum, Turkey

Abstract:	Polycrystalline samples of Y_0.6Gd_0.4Ba_2?xNb_xCu₃O_7?δ and Y_0.6Gd_0.4Ba₂Cu_3?xNb_xO_7?δ with different Nb contents (x=0.025, 0.075, 0.125, 0.175 and 0.225) were prepared using the solid state reaction method. Structural and electrical properties of new compounds were investigated with optical microscope, scanning electron microscopy (SEM), X-ray diffraction (XRD), Four Point Probe (FPP). The results indicated that Nb constituted YBa₂NbO₆ structure instead of substituting to the Y_0.6Gd_0.4Ba₂Cu₃O_7?δ structure. YBa₂NbO₆ structures gathered between grains. Transition temperature did not change significantly, but critical current (J _c) values decreased with increase of Nb concentration. The underlying reason is that the oxygen concentration of compounds remained unchanged due to Gd; thus, T _c values did not change significantly.

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