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

作者：Yilmaz M; Sonmez E^*; Dogan O

来源：Journal of Low Temperature Physics, 2013, 171(1-2): 107-119.

DOI：10.1007/s10909-012-0820-3

• Nb and Gd co-doping to YBCO
• (Y,Gd)Ba2Cu3O7 cuprates

Polycrystalline samples of Y0.6Gd0.4Ba2-x Nb (x) Cu3O7-delta and Y0.6Gd0.4Ba2Cu3-x Nb (x) O7-delta 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 Y0.6Gd0.4Ba2Cu3O7-delta structure. YBa2NbO6 structures gathered between grains. Transition temperature did not change significantly, but critical current (J (c)) values decreased with increase of Nb concentration.

• 出版日期2013-4