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dc.contributor.advisorKim, Yong-Jihm
dc.contributor.authorPacheco-Cabrera, Elluz
dc.description.abstractThis paper consists of an experimental study of the effect of magnetic and non- magnetic impurities in a superconductor MgB2 polycrystalline sample. There are many researches that explain that MgB2 can be easily prepared by the technique PIT. Likewise, there are investigations in which they observed how the magnetic and non-magnetic impurities in doped MgB2 increase their superconducting properties; these studies were performed only with magnetic impurities or only with non-magnetic impurities. But thanks to research conducted by Dr Yong-Jihn Kim, was achieved mixing both the magnetic and non-magnetic impurities in MgB2, their superconducting properties improved. Based in this motivation we started preparing samples of Mg0.88B2Pr0.05Zn0.07 and Mg0.90B2Pr0.05Al0.05 by liquid sintering. We fabricated samples with technique "powder in tube" (PIT), using stainless steel tubes. Structural analysis by X-ray diffraction (XRD) indicating the presence of the main phase which is the MgB2 and small peaks in a smaller proportion of MgO. The electrical characterization, R-T, shows a variation in the width of the critical temperature (Tc). These results successfully complete the first phase of the experimental study of the effect of magnetic and non- magnetic impurities.en_US
dc.description.abstractEl presente trabajo consiste en un estudio experimental del efecto de impurezas magnéticas y no magnéticas en una muestra policristalina del superconductor MgB2. Existen muchas investigaciones en las que explican que el MgB2, puede ser fácilmente preparado mediante la técnica PIT. Así mismo existen investigaciones en las que observaron cómo es que las impurezas magnéticas y no magnéticas dopadas en MgB2 aumentan sus propiedades superconductoras, estas investigaciones se realizaron solo con impurezas magnéticas o solo con impurezas no magnéticas. Pero, gracias a la investigación realizada por el Dr. Yong-Jihn Kim se logró demostrar que mezclando ambas, impurezas magnéticas y no magnéticas en MgB2 mejoraban mucho más sus propiedades superconductoras. Con esta motivación empezamos a fabricar Mg0.88B2Pr0.05Zn0.07 y Mg0.90B2Pr0.05Al0.05 por medio de sinterización líquida. Fabricamos muestras a partir de la técnica “Powder-in-Tube” (PIT), usando tubos de acero inoxidable. El análisis estructural mediante Difracción de Rayos X (DRX) indica la presencia de la fase principal que es el MgB2 y pequeños picos en una menor proporción de MgO. La caracterización eléctrica, R-T, muestra una variación en el ancho de la temperatura crítica (Tc). A partir de estos resultados se concluyó satisfactoriamente la primera fase del estudio experimental del efecto de impurezas magnéticas y no magnéticas.en_US
dc.titleEstudio experimental del efecto de la impureza magnética, Pr, EN, MgB2en_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2015 Elluz Pacheco-Cabreraen_US
dc.contributor.committeeCastellanos, Dorial
dc.contributor.committeeRadovan, Henri
dc.contributor.representativeColon-Reyes, Omar
dc.contributor.collegeCollege of Arts and Science - Scienceen_US
dc.contributor.departmentDepartment of Physicsen_US
dc.description.graduationSemesterSpring (2nd semester)en_US

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