Mr Cyril Makwembere
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Publicado: 11 de octubre de 2012
Quantitative Analysis of A Synthesised YBCO Superconductor by X-Ray Powder Diffractometry
By Cyril T. Makwembere
Moderated by Matthew J. Coombes
Superconductivity is the uniquephenomena of zero resistance to the flow of electrical current. The property was first discovered in metal mercury cooled down in liquid helium by Dutch physicist Heike Kamerlingh Onneson April 8, 1911. This would later become the starting point for a still-developing branch of interest in physics and material sciences.
Due to their unique property, if a loopwere to be made from superconducting material, it would be able to continue carrying an electrical current indefinitely without being attached to a power supply thereafter. Forsuperconductors operate in a superconducting state when they are be kept at incredibly cold temperatures, well below what is called their critical temperature ,Tc. German phycisists WaltherMeissner and Robert Ochsenfeld discovered that below a particular superconductor’s Tc, it was able to expel weak magnetic fields. This property is observable to the human eye. By placinga superconductor that is being cooled to below its Tc under a magnet, almost all of the magnetic field is ejected from the inside of the superconductor and it levitates the magnet.This is called the Meissner effect.
For a long time in the early history of the field’s research, the problem of appropriate cooling was always present with newly developedsuperconductors. Expensive
References
1) http://www.superconductors.org/History.htm 09/03/2012 ; 05:39 AM
2) John C. Gallop (1990). SQUIDS, the Josephson Effects andSuperconducting Electronics. CRC Press. pp. 3, 20. ISBN 0750300515.
3) http://www.magnet.fsu.edu/education/tutorials/magnetacademy/superconductivity101/page7.html 09/03/2012 ; 06:28 AM
By Cyril T. Makwembere
Moderated by Matthew J. Coombes
Superconductivity is the uniquephenomena of zero resistance to the flow of electrical current. The property was first discovered in metal mercury cooled down in liquid helium by Dutch physicist Heike Kamerlingh Onneson April 8, 1911. This would later become the starting point for a still-developing branch of interest in physics and material sciences.
Due to their unique property, if a loopwere to be made from superconducting material, it would be able to continue carrying an electrical current indefinitely without being attached to a power supply thereafter. Forsuperconductors operate in a superconducting state when they are be kept at incredibly cold temperatures, well below what is called their critical temperature ,Tc. German phycisists WaltherMeissner and Robert Ochsenfeld discovered that below a particular superconductor’s Tc, it was able to expel weak magnetic fields. This property is observable to the human eye. By placinga superconductor that is being cooled to below its Tc under a magnet, almost all of the magnetic field is ejected from the inside of the superconductor and it levitates the magnet.This is called the Meissner effect.
For a long time in the early history of the field’s research, the problem of appropriate cooling was always present with newly developedsuperconductors. Expensive
References
1) http://www.superconductors.org/History.htm 09/03/2012 ; 05:39 AM
2) John C. Gallop (1990). SQUIDS, the Josephson Effects andSuperconducting Electronics. CRC Press. pp. 3, 20. ISBN 0750300515.
3) http://www.magnet.fsu.edu/education/tutorials/magnetacademy/superconductivity101/page7.html 09/03/2012 ; 06:28 AM
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