Abstract
In order to investigate the role of Au doping and diffusion-annealingduration on the mechanical properties of Bi–Pb–Sr–Ca–Cu–O,Bi1.8Pb0.35Sr1.9Ca2.1Cu3Oy superconductors were prepared by standard solid-state reaction methods. Doping ofBi-2223 was carried out by means of gold diffusion during sintering from an evaporatedgold film on pellets. The effect of the diffusion-annealing duration on the mechanical andsuperconducting properties of these compounds was investigated using scanning electronmicroscopy, dc resistivity and hardness measurements. These measurements indicated thatthe Au doping and diffusion-annealing time increased the superconducting transitiontemperature, Vickers hardness, Young’s modulus, yield strength, fracture toughness valuesand improved the grain connectivity. The mechanical properties of the samples werefound to be load dependent. In addition, we calculated the load independenthardness, Young’s modulus, yield strength and fracture toughness of the samples.These mechanical properties of the Au-doped samples were dependent on thediffusion-annealing time. Possible reasons for the observed improvements in thesuperconducting and mechanical properties due to Au diffusion are discussed.
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