Synthesis and Study the Structure, electrical and optical properties of Bi2-xCdxSr2Ca2Cu3O10+ δ thin film Superconductors

Abstract

This research includes study and preparation of superconductors compound Bi2-xCdxSr2Ca2Cu3O10+δ (BCSCCO) and thin films by (SSR) and vacuum thermal evaporation methods respectively. The effect of the preparation and partial replacement of bismuth with cadmium of the Bi2-xCdxSr2Ca2Cu3O10+ δ bulk and thin film for (0 ≤ X ≤ 0.09) were studied to obtain the best properties. A series of superconductors Bi2-xCdxSr2Ca2Cu3O10+ δ (BCSCCO) thin films have been deposited on glass substrate at R.T with ratios (X=0.0, 0.03, 0.06 and 0.09) using thermal evaporation technique under the vacuum of 10-6 Torr with (380) nm thickness.XRD analyses of the all superconductors specimens as bulk and thin films showed polycrystalline of multiphase structure exhibited orthorhombic structure with lattice parameter and grain size changes when increase the Cd content percentage in the specimen, The prepared specimens have the dominant phase (Bi-2223) and the secondary phase (Bi-2212).The resistivity and the critical temperature of all specimens prepared bulk and thin films were determined from four point probe measurement, the highest transition temperature Tc obtained for thin film X=0.09 was138K where the oxygen content was 0.3703. The critical temperature for the most films is less than that of the bulk specimens.The optical measurement within the wavelengths in the range (400-1100) nm showed that all films prepared have a direct optical energy gap, and it decrease with the increase Cd content from 2.75eV to 1.7eV while the optical constant computed with Cd content.