Fabrication and chracterisation of Bi₁.₆Pb₀.₄Sr₂Ca₂Cu₃Oᵧ superconductors prepared by solid state reaction technique
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Date
2006
Authors
Fernando, P. R.
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Publisher
University of Peradeniya
Abstract
Three Bismuth based superconducting samples with the composition Bi₁.₆Pb₀.₄Sr₂Ca₂Cu₃Oᵧ were prepared using solid state technique. The Bi₂O₃, PbO, SrCO₃ and CuO powders of 99.99% purity were used as starting raw materials. The powders were mixed with the nominal cation ratio Bi:Pb:Sr:Ca:Cu = 0.8:0.2:1:1:1.5 and the mixed well using dry grinding. Then the powder was divided into three sets and with the labels Sample1, Sample2 and Sample3. Then the samples were calcinated at constant temperature of 820°C and the pallets of diameter 14 mm and of thickness 1-2 mm were prepared under the pressure of 200 kg/cm², 300 kg/cm² and 250 kg/cm² After that the pallets were subjected to preliminary sintering at constant temperature in the furnace and allowed to furnace cooling to room temperature in air.
The resistance measurements at low temperatures were performed on these samples using a resistivity probe. The sample 1 shows the onset superconducting transition temperature Tₒₙₛₑₜ at 103 K and 101 K, when cooling and heating respectively. The sample2 shows the onset superconducting transition temperature Tₒₙₛₑₜ at 111 K and 112 K, when cooling and heating respectively. The sample3 shows the onset superconducting transition temperature Tₒₙₛₑₜ at 110 K and 110 K, when cooling and heating respectively. The XRD measurements were also performed and conclude that the samples consists Bi2223 phases.
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Physics