The Partial Substitution by Lanthanum (La) and its effect on Dielectric Properties for (BSCCO) Superconductor Compound (Bi2Sr2Ca2Cu3-xLaxO10+δ)

Abstract

The superconductor compound (Bi2Sr2Ca2Cu3-xLaxO10+δ) with (x=0,0.05,0.1,0.15,0.2)is prepared by solid state reaction method(SSR). We used the X-ray diffraction technique (XRD) which shows an orthorhombic crystalline system for all the specimens ,also shows that the changing in ( La) concentration leads to decrement in concentration of (Bi-2223), increment in (Bi-2212 ) &(Bi-2201) with appearance of some impurities. Behavior of samples is investigated for electrical resistivity and critical temperature, the samples (x=0.05,0.1) show the semiconductor behavior and other samples (x= 0.15,0.2) show the superconductor transition. The electrical properties( (real Dielectric constant , imaginary Dielectric constant , Loss tangent and Alternating conductivity) are measured as a function of frequency with rang(50Hz-1MHz) at room temperature, The results are demonstrate the evident change in the dielectric properties with increasing ( La) concentration.