Síntesis y evaluación de la morfología, estructura y parámetros electroquímicos de un material magnetocalórico (MMC) fabricado por autocombustión.
The magnetocaloric effect (EMC) is defined as the heating or cooling of magnetic material when the applied magnetic field changes. Various types and families of magnetocaloric materials (MMC) have been developed around the theme of EMC, within which are ceramic magnetocaloric materials (MMCC), and w...
- Autores:
-
Muñoz Mizuno, Andrea Lucía
- Tipo de recurso:
- Fecha de publicación:
- 2020
- Institución:
- Universidad Nacional de Colombia
- Repositorio:
- Universidad Nacional de Colombia
- Idioma:
- spa
- OAI Identifier:
- oai:repositorio.unal.edu.co:unal/78192
- Palabra clave:
- 620 - Ingeniería y operaciones afines
Efecto magnetocalórico
manganitas de lantano
degradación del material
EIS
Magnetocaloric effect
lanthanum manganites
materials degradation
EIS
- Rights
- openAccess
- License
- Atribución-NoComercial-SinDerivadas 4.0 Internacional
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oai:repositorio.unal.edu.co:unal/78192 |
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UNACIONAL2 |
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Universidad Nacional de Colombia |
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| dc.title.spa.fl_str_mv |
Síntesis y evaluación de la morfología, estructura y parámetros electroquímicos de un material magnetocalórico (MMC) fabricado por autocombustión. |
| dc.title.translated.eng.fl_str_mv |
Synthesis and evaluation of the morphology, structure and electrochemical parameters of a magnetocaloric material (MMC) manufactured by auto-combustion |
| title |
Síntesis y evaluación de la morfología, estructura y parámetros electroquímicos de un material magnetocalórico (MMC) fabricado por autocombustión. |
| spellingShingle |
Síntesis y evaluación de la morfología, estructura y parámetros electroquímicos de un material magnetocalórico (MMC) fabricado por autocombustión. 620 - Ingeniería y operaciones afines Efecto magnetocalórico manganitas de lantano degradación del material EIS Magnetocaloric effect lanthanum manganites materials degradation EIS |
| title_short |
Síntesis y evaluación de la morfología, estructura y parámetros electroquímicos de un material magnetocalórico (MMC) fabricado por autocombustión. |
| title_full |
Síntesis y evaluación de la morfología, estructura y parámetros electroquímicos de un material magnetocalórico (MMC) fabricado por autocombustión. |
| title_fullStr |
Síntesis y evaluación de la morfología, estructura y parámetros electroquímicos de un material magnetocalórico (MMC) fabricado por autocombustión. |
| title_full_unstemmed |
Síntesis y evaluación de la morfología, estructura y parámetros electroquímicos de un material magnetocalórico (MMC) fabricado por autocombustión. |
| title_sort |
Síntesis y evaluación de la morfología, estructura y parámetros electroquímicos de un material magnetocalórico (MMC) fabricado por autocombustión. |
| dc.creator.fl_str_mv |
Muñoz Mizuno, Andrea Lucía |
| dc.contributor.advisor.spa.fl_str_mv |
Rojas Reyes, Néstor Ricardo Gómez Zapata, Adrian Augusto |
| dc.contributor.author.spa.fl_str_mv |
Muñoz Mizuno, Andrea Lucía |
| dc.contributor.corporatename.spa.fl_str_mv |
Universidad Nacional de Colombia - Sede Medellín |
| dc.contributor.researchgroup.spa.fl_str_mv |
Instituto de Minerales CIMEX |
| dc.subject.ddc.spa.fl_str_mv |
620 - Ingeniería y operaciones afines |
| topic |
620 - Ingeniería y operaciones afines Efecto magnetocalórico manganitas de lantano degradación del material EIS Magnetocaloric effect lanthanum manganites materials degradation EIS |
| dc.subject.proposal.spa.fl_str_mv |
Efecto magnetocalórico manganitas de lantano degradación del material EIS |
| dc.subject.proposal.eng.fl_str_mv |
Magnetocaloric effect lanthanum manganites materials degradation EIS |
| description |
The magnetocaloric effect (EMC) is defined as the heating or cooling of magnetic material when the applied magnetic field changes. Various types and families of magnetocaloric materials (MMC) have been developed around the theme of EMC, within which are ceramic magnetocaloric materials (MMCC), and within these, lanthanum manganites. The last one has become a focus of research interest, due to the good properties that have been obtained for technological applications in the area of solid state refrigeration. In studies on magnetic refrigeration, a point that must be taken into account; but that is poorly evaluated, is the interaction of the working fluid with the magnetocaloric material, that is, the chemical stability and degradation of the material when exposed to the corrosive/erosive action of the working fluid. The manganites synthesized in this work, have the general formula La0.7Ca0.3Mn1-xNixO3 (x = 0; 0,02; 0,07; 0,1), which were made by solution combustion method. Morphological and structural characterization was performed by Field Emission Scanning Electron Microscopy (FE-SEM) and X-ray diffraction, respectively. Electrochemical behavior was evaluated by Electrochemical Impedance Spectroscopy and Potentiodynamic Polarization curves in a 3.5% NaCl solution. The electrochemical results indicated that the Ecorr values were 2; 87; 79 and 88 mV and for the icorr were 0,78; 0,55; 0,48 and 0,39 µA/cm2 for x = 0; 0.02; 0.07 and 0.1, indicating that doping with nickel could improve the electrochemical resistance of the material. On the other hand, the possible mechanism of degradation of the MMC is the dissolution, evidenced in the overpotential curves, the SEM micrographs and in the color change observed in the electrolyte at the end of the polarization tests. |
| publishDate |
2020 |
| dc.date.accessioned.spa.fl_str_mv |
2020-08-24T16:24:56Z |
| dc.date.available.spa.fl_str_mv |
2020-08-24T16:24:56Z |
| dc.date.issued.spa.fl_str_mv |
2020-04-23 |
| dc.type.spa.fl_str_mv |
Trabajo de grado - Maestría |
| dc.type.driver.spa.fl_str_mv |
info:eu-repo/semantics/masterThesis |
| dc.type.version.spa.fl_str_mv |
info:eu-repo/semantics/acceptedVersion |
| dc.type.content.spa.fl_str_mv |
Text |
| dc.type.redcol.spa.fl_str_mv |
http://purl.org/redcol/resource_type/TM |
| status_str |
acceptedVersion |
| dc.identifier.uri.spa.fl_str_mv |
https://repositorio.unal.edu.co/handle/unal/78192 |
| dc.identifier.instname.spa.fl_str_mv |
Universidad Nacional de Colombia |
| dc.identifier.reponame.spa.fl_str_mv |
Repositorio Institucional Universidad Nacional de Colombia |
| dc.identifier.repourl.spa.fl_str_mv |
https://repositorio.unal.edu.co/ |
| url |
https://repositorio.unal.edu.co/handle/unal/78192 https://repositorio.unal.edu.co/ |
| identifier_str_mv |
Universidad Nacional de Colombia Repositorio Institucional Universidad Nacional de Colombia |
| dc.language.iso.spa.fl_str_mv |
spa |
| language |
spa |
| dc.relation.references.spa.fl_str_mv |
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Atribución-NoComercial-SinDerivadas 4.0 InternacionalDerechos reservados - Universidad Nacional de ColombiaAcceso abiertohttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Rojas Reyes, Néstor Ricardob64971df-81b0-44bc-a5fd-d026947d1b44Gómez Zapata, Adrian Augusto210ada4c-e626-4097-8dba-13725895fc08Muñoz Mizuno, Andrea Lucía835a5161-6379-4c71-bedc-ec5294de8703Universidad Nacional de Colombia - Sede MedellínInstituto de Minerales CIMEX2020-08-24T16:24:56Z2020-08-24T16:24:56Z2020-04-23https://repositorio.unal.edu.co/handle/unal/78192Universidad Nacional de ColombiaRepositorio Institucional Universidad Nacional de Colombiahttps://repositorio.unal.edu.co/The magnetocaloric effect (EMC) is defined as the heating or cooling of magnetic material when the applied magnetic field changes. Various types and families of magnetocaloric materials (MMC) have been developed around the theme of EMC, within which are ceramic magnetocaloric materials (MMCC), and within these, lanthanum manganites. The last one has become a focus of research interest, due to the good properties that have been obtained for technological applications in the area of solid state refrigeration. In studies on magnetic refrigeration, a point that must be taken into account; but that is poorly evaluated, is the interaction of the working fluid with the magnetocaloric material, that is, the chemical stability and degradation of the material when exposed to the corrosive/erosive action of the working fluid. The manganites synthesized in this work, have the general formula La0.7Ca0.3Mn1-xNixO3 (x = 0; 0,02; 0,07; 0,1), which were made by solution combustion method. Morphological and structural characterization was performed by Field Emission Scanning Electron Microscopy (FE-SEM) and X-ray diffraction, respectively. Electrochemical behavior was evaluated by Electrochemical Impedance Spectroscopy and Potentiodynamic Polarization curves in a 3.5% NaCl solution. The electrochemical results indicated that the Ecorr values were 2; 87; 79 and 88 mV and for the icorr were 0,78; 0,55; 0,48 and 0,39 µA/cm2 for x = 0; 0.02; 0.07 and 0.1, indicating that doping with nickel could improve the electrochemical resistance of the material. On the other hand, the possible mechanism of degradation of the MMC is the dissolution, evidenced in the overpotential curves, the SEM micrographs and in the color change observed in the electrolyte at the end of the polarization tests.El efecto magnetocalórico (EMC) consiste en el cambio de temperatura que experimenta un material magnético cuando éste es expuesto a un campo magnético externo variable. Alrededor de la temática del EMC se han desarrollado varios tipos y familias de materiales magnetocalóricos (MMC), dentro de los cuales se encuentran los materiales magnetocalóricos cerámicos (MMCC), y dentro de éstos, las manganitas de lantano. Estas últimas se han convertido en foco de interés investigativo, debido a las buenas propiedades que se han obtenido para aplicaciones tecnológicas en el área de la refrigeración en estado sólido. En estudios sobre refrigeración magnética, un punto que debe tenerse en cuenta; pero que ha sido poco evaluado, es la interacción entre el MMC y el fluido en el que estará inmerso, es decir, la estabilidad química y la degradación del material cuando se expone a la acción oxidante/corrosiva/erosiva del fluido de trabajo. Las manganitas sintetizadas en el presente trabajo, tienen la fórmula general La0.7Ca0.3Mn1-xNixO3 (x = 0; 0,02; 0,07; 0,1), las cuales fueron fabricadas por autocombustión. Al MMC obtenido se le realizó una caracterización morfológica y estructural mediante microscopía electrónica de barrido de emisión de campo y difracción de rayos X, respectivamente. El comportamiento electroquímico del material en estudio se evaluó mediante espectroscopía de impedancia electroquímica y curvas de polarización potenciodinámicas en una solución de NaCl al 3,5%. Los resultados electroquímicos mostraron que los valores de Ecorr fueron de 2; 87; 79 y 88 mV y los de icorr de 0,78; 0,55; 0,48 y 0,39 µA/cm2 para x = 0; 0,02; 0,07 y 0,1, respectivamente, indicando que el dopaje con níquel podría mejorar la resistencia electroquímica del material. Por otro lado, el posible mecanismo de degradación identificado del MMC es la disolución, evidenciado en las curvas de sobrepotencial, las micrografías SEM y en el cambio de coloración observado en el electrolito al finalizar los ensayos de polarización. (texto tomado de la fuente)MaestríaMagíster en Ingeniería – Materiales y Procesos86 páginasapplication/pdfspaUniversidad Nacional de ColombiaMedellín - Minas - Maestría en Ingeniería - Materiales y ProcesosDepartamento de Materiales y MineralesFacultad de MinasMedellínUniversidad Nacional de Colombia - Sede Medellín620 - Ingeniería y operaciones afinesEfecto magnetocalóricomanganitas de lantanodegradación del materialEISMagnetocaloric effectlanthanum manganitesmaterials degradationEISSíntesis y evaluación de la morfología, estructura y parámetros electroquímicos de un material magnetocalórico (MMC) fabricado por autocombustión.Synthesis and evaluation of the morphology, structure and electrochemical parameters of a magnetocaloric material (MMC) manufactured by auto-combustionTrabajo de grado - Maestríainfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/acceptedVersionTexthttp://purl.org/redcol/resource_type/TM“Efecto Magnetocalórico,” La Crónica, 2013. [Online]. 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