In this paper, 2201 and 2212 phases as the corresponding precursor of forming 2212 and 2223 phases are discussed,and the constructive process of unit cell of 2201 phase is ascertained by XRD and chemical kinetics me...In this paper, 2201 and 2212 phases as the corresponding precursor of forming 2212 and 2223 phases are discussed,and the constructive process of unit cell of 2201 phase is ascertained by XRD and chemical kinetics method. Subsequently, the process of 221展开更多
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
文摘In this paper, 2201 and 2212 phases as the corresponding precursor of forming 2212 and 2223 phases are discussed,and the constructive process of unit cell of 2201 phase is ascertained by XRD and chemical kinetics method. Subsequently, the process of 221
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.
