[논문]Electrical Properties of a High Tc Superconductor for Renewed Electric Power Energy

Lee Sang-Heon

doi:10.5370/jeet.2006.1.3.371

Electrical Properties of a High Tc Superconductor for Renewed Electric Power Energy 원문보기

Journal of electrical engineering & technology, v.1 no.3, 2006년, pp.371 - 375

Lee Sang-Heon (Department of Electronic Engineering, Sun Moon University)

Abstract ▼ AI-Helper

Effects of $Ag_2O$ doping on the electromagnetic properties in the BiSrCaCuO superconductor. The electromagnetic properties of doped and undoped $Ag_2O$ in the BiSrCaCuO superconductor were evaluated to investigate the contribution of the pinning centers. It was confirmed experimentally that a larger amount of magnetic flux was trapped in the $Ag_2O$ doped sample than in the undoped one, indicating that the pinning centers of magnetic flux are related closely to the occurrence of the magnetic effect. We have fabricated superconductor ceramics by the chemical process. A high Tc superconductor with a nominal composition of $Bi_2Sr_2Ca_2Cu_3O_y$ was prepared by the organic metal salts method. Experimental results suggest that the intermediate phase formed before the formation of the superconductor phase may be the most important factor. The relation between electromagnetic properties of Bi HTS and the external applied magnetic field was studied. The electrical resistance of the superconductor was increased by the application of the external magnetic field. But the increase in the electrical resistance continues even after the removal of the magnetic field. The reason is as follows; the magnetic flux due to the external magnetic field penetrates through the superconductor and the penetrated magnetic flux is trapped after the removal of the magnetic flux. During the sintering, doped $Ag_2O$ was converted to Ag particles that were finely dispersed in superconductor samples. It is considered that the area where normal conduction takes place increases by adding $Ag_2O$ and the magnetic flux penetrating through the sample increases. The results suggested that $Ag_2O$ acts to amplify pinning centers of magnetic flux, contributing to the occurrence of the electromagnetic properties.

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제안 방법

The electromagnetic properties of both the Ag2O doped and undoped BiSrCaCuO superconductor were evaluated to investigate the contribution of the pinning centers. It was confirmed experimentally that a larger amount of magnetic flux was trapped in the Ag2O doped sample than that in the undoped one, indicating that the pinning centers of magnetic flux are related closely to the occurrence of the magnetic effect.
Above the critical current the slope dv/di increases, and the voltage drop increases with current until the liner flux flow region is attained. This paper reported the fabrication of the BiSrCaCuO high Tc superconductor by the organic metal salts method, and the characteristic change of flux flow resistivity with external magnetic field and field polarity.

이론/모형

The phases formed after calcinations and sintering were analyzed by X-ray powder diffraction (XRD) using CuK% radiation. The compositions of the sample were evaluated by electron probe micro analysis (EPMA). The U shaped superconductors were polarized by field cooling at 77 K with a samarium cobalt rear earth permanent magnet of B = 0.

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