Lab Report 9

Lab Report 9 - of the Meissner effect This also works...

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John Xu 5/4/07 Lab Report Experiment 9: Preparation of a High-Temperature Superconductor The BaO 2 , Y(OH) 3 and CuO were mixed together. They were ground using a mortar and pestle until there were no streaks left and everything was a fine gray powder. The final pellet was a dark gray color. This indicated that it was a superconductor as opposed to a green non- conducting phase. Part I: Meissner Effect The pellet was placed in the cup and the magnet was placed on top. When liquid nitrogen was poured, some bubbling occurred as the apparatus was cooled. The magnet levitated above the pellet once everything was sufficiently cooled. This is due to the electric current that flows over the superconductor, which then repels the magnetic field of the rare-earth magnet characteristic
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Unformatted text preview: of the Meissner effect. This also works because the magnet is very strong and small, which allows the levitation to counter the effects of gravity. When magnets were placed together, this repulsion became stronger as the magnet levitated higher. Part II: Loss of Electrical Resistance The pellet attached to the 4-pronged clip caused a constant fluctuation in voltage. Once the pellet was immersed in liquid nitrogen, the voltage was close to 0.00 mV. The electrical resistance disappeared. This is due to the flow of electrons typical of superconductors. Unlike normal conductors where the electrons collide in an electric current and energy is lost, the electrons in the superconductor flow without collisions....
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