利用BaO_2原料制取单相致密YBa_2Cu_3O_(7-δ)陶瓷  

Dense and Single-Phase YBa_2Cu_3O_(7-δ) Superconductor Prepared with BaO_2

作　　者：赵梅瑜[1] 李承恩[1] 金行运[1] 黄野明[1] 卢永康[1] 周恩济[1] 

机构地区：[1]中国科学院上海硅酸盐研究所

出　　处：《无机材料学报》1991年第1期33-38,共6页Journal of Inorganic Materials

摘　　要：本工作采用 BaO_2为原料制备 YBa_2Cu_3O_(7-δ)超导体材料,采用固相反应合成工艺和普通烧成条件,所得的超导体具有下列特性:(1)单相性好。由 X 射线衍射分析为单纯的正交相;(2)含碳量低,所得的 YBa_2-Cu_3O_(7-δ)陶瓷其含碳量比以 BaC_2O_4为原料的 YBa_2Cu_3O_(7-δ)陶瓷低一半;(3)YBa_2Cu_3O_(7-δ)陶瓷的烧结温度比较低,致密度高,密度可达理论值的90%以上,显气孔率只有5.78%;(4)采用相同的制备工艺,所得YBa_2Cu_3O_(7-δ)陶瓷的电流密度比以 BaC_2O_4为原料的 YBa_2Cu_3O_(7-δ)陶瓷提高3倍左右。The relationship between raw materials,processing microstructure and physicalproperties for YBa_2Cu_3O_(7-δ) ceramics was investigated.Two kinds of Ba-containedmaterials were used as raw mateials,one w(?)s BaO_2 and the other was BaC_2O_4.TheYBa_2Cu_3O_(7-δ) ceramics were prepared by the solid state reaction method.Physicalproperties,such as sintering shrinkage,density,transition temperature and criticalcurrent ect were measured.The microstructures of these two kinds of YBa_2Cu_3O_(7-δ)ceramics were characterized by SEM and optical mic(?)oscope.A singlephase materialwith orthorhombic structure was obtained for this YBCO ceramics prepared withBaO_2.The carbon content of this YBCO material is low and the relative density isabout 90%.The critical current of this YBCO ceramics is higher than that of YBCOprepared with BaC_2O_4.It seems likely that high-quality,single-phase YBa_2Cu_3O_(7-δ)ceramic samples with orthorhombic structure could be made by using BaO_2 as rawmatcrial and solid state reaction processing.

关 键 词：超导体 陶瓷 氧化钡 YBA2CU3O7-Δ 

分 类 号：TQ174.262[化学工程—陶瓷工业]