The citrate gel of (Bi, Pb), Sr, Ca and Cu and the (Bi, Pb)SrCaCu(O, F) superconductor were prepared using citrate as the organic complex agent and 2ethyl hexanol as the dehydrating agent. The starting material was a ...The citrate gel of (Bi, Pb), Sr, Ca and Cu and the (Bi, Pb)SrCaCu(O, F) superconductor were prepared using citrate as the organic complex agent and 2ethyl hexanol as the dehydrating agent. The starting material was a highpurity nitrate solution containing the desired ions in the appropriate atomic ratio. The optimum temperature and pH to obtain the homogeneous gel precursor were estimated. IR and DSC were employed to study the thermal decomposition and the calcination of the precursor material. After the calcined powder was sintered, a nearly singlephase (Bi, Pb)2Sr2Ca2Cu3Ox superconductor with the transition temperature 105 K was synthesized. The effect of the doping of Pb and F was also studied in the paper.展开更多
BiVxSrCaCu2 Oysystem glasses were prepared by using doubleroller quenching method. Thedifferentialthermal analysis was employed to investigate the effect of V doping on glass forming ability( GFA). Theresultsshowedth...BiVxSrCaCu2 Oysystem glasses were prepared by using doubleroller quenching method. Thedifferentialthermal analysis was employed to investigate the effect of V doping on glass forming ability( GFA). Theresultsshowedthatthe GFAof Bisystem increases withthein creasing ofthe amountof Vdoping. Thebestatomic ratiofor having both superconductivityandthegreatest GFAwas BiV0 18 CaCu2 Oy .展开更多
文摘The citrate gel of (Bi, Pb), Sr, Ca and Cu and the (Bi, Pb)SrCaCu(O, F) superconductor were prepared using citrate as the organic complex agent and 2ethyl hexanol as the dehydrating agent. The starting material was a highpurity nitrate solution containing the desired ions in the appropriate atomic ratio. The optimum temperature and pH to obtain the homogeneous gel precursor were estimated. IR and DSC were employed to study the thermal decomposition and the calcination of the precursor material. After the calcined powder was sintered, a nearly singlephase (Bi, Pb)2Sr2Ca2Cu3Ox superconductor with the transition temperature 105 K was synthesized. The effect of the doping of Pb and F was also studied in the paper.
文摘BiVxSrCaCu2 Oysystem glasses were prepared by using doubleroller quenching method. Thedifferentialthermal analysis was employed to investigate the effect of V doping on glass forming ability( GFA). Theresultsshowedthatthe GFAof Bisystem increases withthein creasing ofthe amountof Vdoping. Thebestatomic ratiofor having both superconductivityandthegreatest GFAwas BiV0 18 CaCu2 Oy .
