Evaluation of the magnetocaloric effect in nano-crystalline La0.7Ca0.3Mn1-xAlxO3 manganites synthesized via wet-chemistry methods
| dc.contributor.advisor | Morán Campaña, Jesús Oswaldo | |
| dc.contributor.author | Chaverra González, Diego Fernando | |
| dc.contributor.orcid | Moran Campaña, Oswaldo [0000-000170720343] | |
| dc.date.accessioned | 2026-01-26T15:38:21Z | |
| dc.date.available | 2026-01-26T15:38:21Z | |
| dc.date.issued | 2026-01-25 | |
| dc.description.abstract | Nanosized La0.7Ca0.3Mn1-xAlxO3 (x=0, 0.02, 0.07, 0.1) manganites were synthesized via two different wet-chemistry methods, namely Pechini auto-combustion. The samples were carefully studied after their structural, chemical, and magnetic properties by means of standard characterization methods. Analysis of the X-ray diffraction patterns indicated that the samples were single phase with orthorhombic perovskite-type structure, within the accuracy limit of the technique. The lattice parameters were obtained by means of Rietveld refinement of the X-ray diffraction patterns. The targeted Al3+ doping of the pristine La0.7Ca0.3MnO3 sample was verified by the systematic shifting of the diffraction peaks towards higher values of the 2-angle. The elemental composition of the samples as well as the chemical environment of Mn-ion were investigated by means of X-ray photoelectron spectroscopy. The magnetic properties of the samples were carefully studied using vibrating sample magnetometry. The dependence of the magnetization on the temperature recorded, in field as high as 200 Oe, showed a clear paramagnetic-ferromagnetic transition for all studied samples. In turn, well-defined hysteresis was observed at several temperatures below the Curie temperature for all the measured samples. The magnetocaloric function of the samples was evaluated from the isothermal magnetization versus field curves, recorded around the Curie temperature. From the static magnetic measurement results, near the respective transition temperatures, the critical behavior of the different samples was carefully investigated. The analysis of the experimental data was carried out by means of various techniques, such as modified Arrott plots, the Kouvel-Fisher method, and critical isotherm analysis. The application of these models allowed determining the values of the critical exponents , , and . | eng |
| dc.description.curriculararea | Física.Sede Medellín | |
| dc.description.degreelevel | Maestría | |
| dc.description.degreename | Magíster en Ciencias - Física | |
| dc.description.notes | Se sintetizaron manganitas nanométricas de La0.7Ca0.3Mn1−xAlxO3 (x = 0, 0.02, 0.07, 0.1) mediante dos métodos diferentes de química húmeda, a saber, auto-combustión tipo Pechini. Las muestras se estudiaron cuidadosamente en cuanto a sus propiedades estructurales, químicas y magnéticas mediante métodos estándar de caracterización. El análisis de los patrones de difracción de rayos X indicó que las muestras eran monofásicas con una estructura ortorrómbica tipo perovskita, dentro del límite de precisión de la técnica. Los parámetros de red se obtuvieron mediante el refinamiento de Rietveld de los patrones de difracción de rayos X. El dopaje objetivo con Al³⁺ de la muestra prístina La0.7Ca0.3MnO3 se verificó por el desplazamiento sistemático de los picos de difracción hacia valores más altos del ángulo 2θ. La composición elemental de las muestras, así como el entorno químico del ion Mn, se investigaron mediante espectroscopía de fotoelectrones de rayos X. Las propiedades magnéticas de las muestras se estudiaron cuidadosamente utilizando magnetometría de muestra vibrante. La dependencia de la magnetización con la temperatura, registrada bajo un campo de hasta 200 Oe, mostró una clara transición paramagnética–ferromagnética para todas las muestras estudiadas. A su vez, se observó una histéresis bien definida a varias temperaturas por debajo de la temperatura de Curie para todas las muestras medidas. La función magnetocalórica de las muestras se evaluó a partir de las curvas de magnetización isotérmica en función del campo, registradas alrededor de la temperatura de Curie. A partir de los resultados de las mediciones magnéticas estáticas, cerca de las respectivas temperaturas de transición, se investigó cuidadosamente el comportamiento crítico de las diferentes muestras. El análisis de los datos experimentales se realizó mediante diversas técnicas, como los diagramas de Arrott VIII Evaluation of the magnetocaloric effect in nano-crystalline La0.7Ca0.3Mn1- xAlxO3 manganites synthesized via wet-chemistry methods modificados, el método de Kouvel-Fisher y el análisis de isotermas críticas. La aplicación de estos modelos permitió determinar los valores de los exponentes críticos β, γ y δ. (Texto tomado de la fuente) | spa |
| dc.description.researcharea | Materiales magnetocáloricos | |
| dc.format.extent | 1 recurso en línea (83 páginas) | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.instname | Universidad Nacional de Colombia | spa |
| dc.identifier.reponame | Repositorio Institucional Universidad Nacional de Colombia | spa |
| dc.identifier.repourl | https://repositorio.unal.edu.co/ | spa |
| dc.identifier.uri | https://repositorio.unal.edu.co/handle/unal/89319 | |
| dc.language.iso | eng | |
| dc.publisher | Universidad Nacional de Colombia | |
| dc.publisher.branch | Universidad Nacional de Colombia - Sede Medellín | |
| dc.publisher.faculty | Facultad de Ciencias | |
| dc.publisher.place | Medellín, Colombia | |
| dc.publisher.program | Medellín - Ciencias - Maestría en Ciencias - Física | |
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| dc.rights.accessrights | info:eu-repo/semantics/openAccess | |
| dc.rights.license | Reconocimiento 4.0 Internacional | |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | |
| dc.subject.ddc | 530 - Física::538 - Magnetismo | |
| dc.subject.lemb | Magnetrometría | |
| dc.subject.lemb | Magnetización | |
| dc.subject.proposal | Manganitas | spa |
| dc.subject.proposal | Peroskitas | spa |
| dc.subject.proposal | Efectos magnetocalórico, | spa |
| dc.subject.proposal | Autocombustion | spa |
| dc.subject.proposal | Exponentes críticos | spa |
| dc.subject.proposal | Magnetocaloric | eng |
| dc.subject.proposal | Auto-combustion | eng |
| dc.subject.proposal | Critical exponents | eng |
| dc.title | Evaluation of the magnetocaloric effect in nano-crystalline La0.7Ca0.3Mn1-xAlxO3 manganites synthesized via wet-chemistry methods | eng |
| dc.title.translated | Evaluación del efecto magnetocalórico en la manganita nano cristalina La0.7Ca0.3Mn1-xAlxO3 sintetizada vía métodos de química mojada | |
| dc.type | Trabajo de grado - Maestría | |
| dc.type.coar | http://purl.org/coar/resource_type/c_bdcc | |
| dc.type.coarversion | http://purl.org/coar/version/c_ab4af688f83e57aa | |
| dc.type.content | Text | |
| dc.type.driver | info:eu-repo/semantics/masterThesis | |
| dc.type.redcol | http://purl.org/redcol/resource_type/TM | |
| dc.type.version | info:eu-repo/semantics/acceptedVersion | |
| dcterms.audience.professionaldevelopment | Investigadores | |
| dcterms.audience.professionaldevelopment | Público general | |
| oaire.accessrights | http://purl.org/coar/access_right/c_abf2 |