利用氘粒子活化分析测定高温超导体中的氧含量

DETERMINATION OF OXYGEN CONTENT IN HIGH T_c SUPERCONDUCTORS BY DEUTERON PARTICLE ACTIVATION ANALYSIS

详细介绍测量高温超导体含氧量的实验方法。测定了YBa_2Cu_3O_y,和Bi_2Sr_2CaCuO_y两类超导体内氧的含量。发现在YBa_2Cu_(3(1-X))O_y和Bi_(2(1-x))Sr_2CaCu_2O_y中随着Cu缺位的增大,氧的变化趋势。用x射线粉末衍射法测量YBa_2Cu_(3(1-x))O_y表明,在x=0—0.2的变化范围内是正交相。随着Cu缺位增加,室温电阻率很快增加,而临界电流密度很快减小。

The experimental method for determining the oxygen content in high Tc superconduc tors is described in detail. This method is applied to determination of oxygen content in high Tc Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O samples in which the stoichiometry is varied by reducing the copper and bismuth concentrations. The oxygen concentration is found to vary linearly with Cu (x= 0-0,2) and Bi (x= 0-0.4) deficiencies in YBa2Cu3(1-x)Oy and Bi2(1-x) Sr2CaCu2Oy respectively. X-ray powder diffraction measurements show that the compound of YBa2Cu3(1-x)Oy, is orthorhombic in the variation range of x=0-0.2