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Osorio, A., (2013). Estudio cristalográfico del superconductor YBa2Cu3O7 sintetizado por el método sol-gel [Tesis, Universidad Nacional de Ingeniería]. http://hdl.handle.net/20.500.14076/1154
Osorio, A., Estudio cristalográfico del superconductor YBa2Cu3O7 sintetizado por el método sol-gel [Tesis]. : Universidad Nacional de Ingeniería; 2013. http://hdl.handle.net/20.500.14076/1154
@mastersthesis{renati/255332,
title = "Estudio cristalográfico del superconductor YBa2Cu3O7 sintetizado por el método sol-gel",
author = "Osorio Anaya, Ana María",
publisher = "Universidad Nacional de Ingeniería",
year = "2013"
}
Title: Estudio cristalográfico del superconductor YBa2Cu3O7 sintetizado por el método sol-gel
Authors(s): Osorio Anaya, Ana María
Advisor(s): Mendoza Apolaya, Atilio
Issue Date: 2013
Institution: Universidad Nacional de Ingeniería
Abstract: Se logró sintetizar el cerámico superconductor YBa2Cu3O7 (Y-123) por Sol-Gel,a partir de acetatos de Y, Ba y Cu, en cantidades estequiométricas, y por reacción de metátesis con solución de oxalato se obtuvo un precursor sólido que luego de tratamientos térmicos alcanzó la composición química del Y-123.
Los resultados de la medición DR-X demostraron que los paramétros refinados por el método de Rietveld fueron a=3,8227Å, b=3,8832Å y c=11,6802Å, correspondientes al sistema rómbico. Los parámetros a y b son ligeramente diferentes entre sí pero a su vez son aproximados a los parámetros a y b de
una perovkskita cúbica (CaTiO3) cuyo valor es de 3,905Å. Adicional a ello se
observa que el parámetro c del superconductor tiene correspondencia con 3 valores aproximados del parámetro c de la perovskita cúbica, demostrando de esta manera que la estructura del superconductor corresponde a una estructura de triple perovskita cúbica por aproximación.
Las medidas magnetométricas por SQUID en flujo de helio líquido a 4K del material sintetizado presentó una temperatura crítica (Tc) de superconductividad de 92K (-181°C), lo cual corresponde a un superconductor de alta temperatura.
Los estudios a realizarse de estos materiales, haciendo uso de los conocimientos de Cristalografía Estructural servirán de base para sintetizar nuevas estructuras ya sea con estequiometrias variadas o ya sea dopadas, las que a su vez influirán en las propiedades de estos nuevos materiales, para potenciales aplicaciones futuras, como en la fabricación de generadores eléctricos de alta potencia, trenes de levitación magnética, cables eléctricos superconductores, entre otros.
Through the Sol-Gel method, it was possible to synthesize the superconducting ceramic YBa2Cu3O7 (Y-123),since chemical reagents such as Y, Ba and Cu acetates in stoichiometric amounts, and by metathesis reaction with oxalate solution, a solid precursor was obtained which after heat treatments, it reached the chemical composition of Y- 123. The results of the DR- X measurement demonstrated that the parameters refined by the Rietveld method were a=3,8227Å, b=3,8832Å and c=11,6802Å, to the rhombic system . The parameters a and b are slightly different from each other but at the same time, they are approximated to the parameters a and b of a cubic perovkskita (CaTiO3) with a value of 3,905 Å. It is observed that the parameter c of the superconductor has correspondence with 3 approximate values of parameter c of the cubic perovskite, demonstrating therefore that the superconducting structure corresponds to a structure of triple cubic perovskiteby approximation. The SQUID magnetometer measures heliumat 4K, the synthesized material submitted a critical temperature of superconductivity (Tc) of 92K (-181°C), which corresponds to a high temperature superconductor. The studies to be carried of these materials, employing knowledge of Structural Crystallography will be the basis for synthesizing new structures either with varied or doped stoichiometries, which at the same timewill influence in the properties of these new materials, and willhelp in future potential applications, such as in the manufacture of high power electrical generators, magnetic levitation trains, superconducting power cables, among others.
Through the Sol-Gel method, it was possible to synthesize the superconducting ceramic YBa2Cu3O7 (Y-123),since chemical reagents such as Y, Ba and Cu acetates in stoichiometric amounts, and by metathesis reaction with oxalate solution, a solid precursor was obtained which after heat treatments, it reached the chemical composition of Y- 123. The results of the DR- X measurement demonstrated that the parameters refined by the Rietveld method were a=3,8227Å, b=3,8832Å and c=11,6802Å, to the rhombic system . The parameters a and b are slightly different from each other but at the same time, they are approximated to the parameters a and b of a cubic perovkskita (CaTiO3) with a value of 3,905 Å. It is observed that the parameter c of the superconductor has correspondence with 3 approximate values of parameter c of the cubic perovskite, demonstrating therefore that the superconducting structure corresponds to a structure of triple cubic perovskiteby approximation. The SQUID magnetometer measures heliumat 4K, the synthesized material submitted a critical temperature of superconductivity (Tc) of 92K (-181°C), which corresponds to a high temperature superconductor. The studies to be carried of these materials, employing knowledge of Structural Crystallography will be the basis for synthesizing new structures either with varied or doped stoichiometries, which at the same timewill influence in the properties of these new materials, and willhelp in future potential applications, such as in the manufacture of high power electrical generators, magnetic levitation trains, superconducting power cables, among others.
Link to repository: http://hdl.handle.net/20.500.14076/1154
Discipline: Maestría en Ciencias con Mención en Ingeniería Geológica
Grade or title grantor: Universidad Nacional de Ingeniería. Facultad de Ingeniería Geológica, Minera y Metalúrgica. Unidad de Posgrado
Grade or title: Maestro en Ciencias con Mención en Ingeniería Geológica
Register date: 26-Jun-2015
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