摘要
用 Bi_2O_3、PbO,SrCO_3、CaCO_3以及 CuO 为原料,近乎 Bi∶Sr∶Ca∶Cu=1∶1∶1∶2配比,其中0.3的 Bi 用 Pb 替代。配料充分研、混后,进行800℃,712小时煅烧。随之再细磨、压型,并经840℃～880℃、250小时以上烧结。块样零电阻温度达112K。将块样包银,轧制成薄带,且进行830～840℃、60小时以上烧结,最好带样(s=0.45mm^2)在77K、OT 下通入30安培电流(6600A/cm^2),仍保持超导态。作者认为,该材料存在更高的临界电流密度。
As starting material using Bi2O3 (analysis purity) , PbO (>99%) , SrCO3 (>99%) , CaCO3 (>99%) and CuO (>99%), an approximate ratio Bi: Sr : Ca : Cu = 1 : 1 : 1 : 2 of -which 0.3 Bi was replaced by Pb, they were fully mixed,and calcined at 800℃ for over 21 hours in air. This material was reground, and formed into plate. After the plates were sintered at 840℃-880℃ for over 250 hours, the bulk's Tc was as high as 112K. The bulk sample was clothed with silver, rolled into tape and sintered at 830 -840℃ for over 50 hours in air. The best sample (s = 0.45mm2) can be transported 6600A/cm2 current density (flow 30 amperes) at 77K and zero field, and remained zero resistence superconducting state. We are sure that this material will exhibit higher critical current density.
出处
《低温与超导》
CAS
CSCD
北大核心
1990年第2期37-41,共5页
Cryogenics and Superconductivity
基金
国家超导技术联合研究开发中心资助
