Superconducting Properties of Hg0.8Cu0.15Sb0.05Ba2Ca2Cu3O8+δ Ceramic with Controlling Sintering Conditions
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Hg0.8Cu0.15Sb0.05Ba2Ca2Cu3O8+δ High temperature superconducting samples were prepared by using a standard solid-state reaction method with different sintering temperatures of 1073, 1093, 1113, 1133 and 1153 K. The electrical resistivity measurements showed that the sintering conditions have major effects on the transition temperature of the superconducting compound. The samples prepared at 1113 and 1153 K have transition temperatures at zero resistivity T c(offset)=107,112 K and T c(onset)=121,128 K respectively. Meanwhile, the sample prepared at 1133 has highest transition temperature T c(offset)=121 K and T c(onset)=134 K. However, the samples which were prepared at 1073 and 1093 K showed metallic behavior with respect to temperature, but this could not help us to obtain the values of T c(off) because they were less than the point of liquid nitrogen. The effect of sintering times on the transition temperature has been investigated by using the samples prepared at 1133 K. The value of T c(offset) at the sintering times of 16–24 hours rises from 121 K to 126 K. The XRD data collected from various samples were all polycrystalline. It was found that the increase of sintering temperatures from 1073–1153 K caused an extremely high amount of decomposition of the low-phase (1212) superconductor and produced high-phase (1223) superconductors. The oxygen content (δ), volume fraction V Ph(1223) and the lattice parameters were changing with the increase of the sintering temperature.
KeywordsHg0.8Cu0.15Sb0.05Ba2Ca2Cu3O8+δ Tc Superconducting Volume fraction
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