Preparation And Properties Of YBCO Superconducting Materials Research

Superconductors are materials those have zero resistance and Meissner effect when they are in the low temperature. If the critical temperature is low than 40K,we call it low temperature superconductor, or it is high temperature supercondctor. The critical temperature of YBCO firstly reached 90K.We study the effect of O2 ontent, sintering time and annealling temperature to the sample.Firstly, Changing the sintering temperature can change the properties of YBCO.when the sintering temperature is low,the samples are non-supercondctive,and their color is green or gray.And we consider 960℃ is the appropriate temperature,the samples are black.In the XRD the primary peak appeared, it's superconductive. The annealling time also effects the material of YBCO.If the annealling time is too short, the chemical reaction cannot be completely, the time is longer, and the properties are best. But the reaction period is too long, so we adopted 3 days.Disfigurement can improve the Jc of superconductors when they are adulterated into the crystalloid. So ZnO nanorods are also studied in the research. At low temperature, the ZnO nanorods were synthesized by the refluxing method in the presence of DBS (Dodecyl benzene sulfonic acid sodiumsalt). The samples were characterized by SEM, optics microscopy and XRD techniques. It was found that the parameters including the temperature, the content of surfactant, the ultrasonic and refluxing time had important influence on the formation of the ZnO nanorods. Compared with other methods, that used ultrasonic and low temperature conditions were key to form uniform ZnO nanorods with smaller diameter.