الفهرس 
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Abstract
The HTc-YBCO ceramic superconductors are very important
materials due to their useful technological applications in co~nputss.
corninunications, supernlagnets (air-trains), etc. The success of thess
technological applications is related to many parameters, includins,
critical temperature (Tc), critical current density (Jc), mechanical
properties, and the chemical stability for the intended superconductors.
Generally, the high-Tc superconductor are considered the next revolution
in the technological science field, over all the world. Thus, YBa2C~307-6
(YBCO) HTc-superconductor is essential class of solid state materials
which generally have oxygen-deficient perovskite orthorhoinbic crystal
form that responsible for its superconductivity. Dopants additives have
been employed to improve the properties of HTc-superconductors (Tc-
Jc). Thus, in the present thesis after updating full literature survey, the
undoped and doped-YBCO superconductors were prepared by the
conventional solid state reaction and sintering technique.