Abstract
The improvement of preparation process of <TEX>${YBa_2}{Cu_3}{O_x}$</TEX> superconductor and its conducting properties is important for practical applications. In this study, the additives such as <TEX>$Ag_{2}O$</TEX> and PbO were used to improve the preparation conditions of <TEX>${YBa_2}{Cu_3}{O_x}$</TEX> superconducting bulk samples and the properties of <TEX>${YBa_2}{Cu_3}{O_x}$</TEX> superconductors prepared with powders using sol-gel method and solid state reaction method were studied. The effects of the different powders and the additives to the density, grain alignment, and porosity of samples, that affect the critical current density of superconductor, also have been investigated. It is found that the properties of <TEX>${YBa_2}{Cu_3}{O_x}$</TEX> prepared with sol-gel synthesized powder and the additives showed better superconductivities than those of conventionally prepared superconductors.
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