Bulk materials and thin films of pure and homogeneous YBa2Cu3O7-x and Bi2Sr2CaCu2O8+x compounds were prepared by a nanocomposite solution-sol-gel (SSG) method. The superconducting oxides of YBa2Cu3O7-x and Bi2Sr2CaCu2O8+x were prepared at very low temperatures i.e. 750°C and 850°C, respectively by SSG method. Pellets sintered from these nanophasic sol powders showed sharp resistivity drops at T c ∼ 90°K for YBa2Cu3O7-x and T c∼67°K for Bi2Sr2CaCu2O8+x . Thin films were prepared using triphasic sol of Y, Ba, Cu and tetraphasic sol of Bi, Sr, Ca and Cu on MgO and SrTiO3 substrates. The triphasic sol coated on SrTiO3 substrates and calcined at 800°C for 12h showed the formation of superconducting phase, YBa2Cu3O7-x with preferred orientation along the C-axis. X-ray diffraction patterns of the Bi2Sr2CaCu2O8+x films on MgO substrate showed the formation of the superconducting phase with preferential orientation along the C-axis and the microwave absorption data as a function of temperature of this film revealed the onset temperature to be 90°K.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials