Direct observation of magnetocaloric effect by differential thermal analysis: Influence of experimental parameters

The magnetocaloric effect is the isothermal change of magnetic entropy and the adiabatic temperature change induced in a magnetic material when an external magnetic field is applied. In this work, we present an experimental setup to study this effect in metamagnetic transitions, using the differenti...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Sacanell, Joaquín Gonzalo, Quintero, Mariano Horacio
Publicado: 2012
Materias:
Adiabatic temperature change
Calorimetric measurements
Differential thermals
Experimental parameters
Experimental setup
External magnetic field
Low temperatures
Magnetic entropy
Metamagnetic transitions
Phase separation effects
Temperature changes
Differential thermal analysis
Magnetic materials
Magnetocaloric effects
Manganese oxide
Phase separation
Magnetic fields
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09214526_v407_n16_p3305_RotsteinHabarnau
http://hdl.handle.net/20.500.12110/paper_09214526_v407_n16_p3305_RotsteinHabarnau
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_09214526_v407_n16_p3305_RotsteinHabarnau
record_format dspace
spelling paper:paper_09214526_v407_n16_p3305_RotsteinHabarnau2023-06-08T15:50:40Z Direct observation of magnetocaloric effect by differential thermal analysis: Influence of experimental parameters Sacanell, Joaquín Gonzalo Quintero, Mariano Horacio Adiabatic temperature change Calorimetric measurements Differential thermals Experimental parameters Experimental setup External magnetic field Low temperatures Magnetic entropy Metamagnetic transitions Phase separation effects Temperature changes Differential thermal analysis Magnetic materials Magnetocaloric effects Manganese oxide Phase separation Magnetic fields The magnetocaloric effect is the isothermal change of magnetic entropy and the adiabatic temperature change induced in a magnetic material when an external magnetic field is applied. In this work, we present an experimental setup to study this effect in metamagnetic transitions, using the differential thermal analysis technique, which consists in measuring simultaneously the temperatures of the sample of interest and a reference one while an external magnetic field ramp is applied. We have tested our system to measure the magnetocaloric effect in La 0.305Pr 0.32Ca 0.375MnO 3, which presents phase separation effects at low temperatures (T<200 K). We obtain ΔT vs H curves, and analyze how the effect varies by changing the rate of the magnetic field ramp. Our results show that the intensity of the effect increases with the magnetic field change rate. We also have obtained the effective heat capacity of the system without the sample by performing calorimetric measurements using a pulse heat method, fitting the temperature change with a two tau description. With this analysis, we are able to describe the influence of the environment and subtract it to calculate the adiabatic temperature change of the sample. © 2012 Elsevier B.V. Fil:Sacanell, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Quintero, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09214526_v407_n16_p3305_RotsteinHabarnau http://hdl.handle.net/20.500.12110/paper_09214526_v407_n16_p3305_RotsteinHabarnau
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Adiabatic temperature change
Calorimetric measurements
Differential thermals
Experimental parameters
Experimental setup
External magnetic field
Low temperatures
Magnetic entropy
Metamagnetic transitions
Phase separation effects
Temperature changes
Differential thermal analysis
Magnetic materials
Magnetocaloric effects
Manganese oxide
Phase separation
Magnetic fields
spellingShingle Adiabatic temperature change
Calorimetric measurements
Differential thermals
Experimental parameters
Experimental setup
External magnetic field
Low temperatures
Magnetic entropy
Metamagnetic transitions
Phase separation effects
Temperature changes
Differential thermal analysis
Magnetic materials
Magnetocaloric effects
Manganese oxide
Phase separation
Magnetic fields
Sacanell, Joaquín Gonzalo
Quintero, Mariano Horacio
Direct observation of magnetocaloric effect by differential thermal analysis: Influence of experimental parameters
topic_facet Adiabatic temperature change
Calorimetric measurements
Differential thermals
Experimental parameters
Experimental setup
External magnetic field
Low temperatures
Magnetic entropy
Metamagnetic transitions
Phase separation effects
Temperature changes
Differential thermal analysis
Magnetic materials
Magnetocaloric effects
Manganese oxide
Phase separation
Magnetic fields
description The magnetocaloric effect is the isothermal change of magnetic entropy and the adiabatic temperature change induced in a magnetic material when an external magnetic field is applied. In this work, we present an experimental setup to study this effect in metamagnetic transitions, using the differential thermal analysis technique, which consists in measuring simultaneously the temperatures of the sample of interest and a reference one while an external magnetic field ramp is applied. We have tested our system to measure the magnetocaloric effect in La 0.305Pr 0.32Ca 0.375MnO 3, which presents phase separation effects at low temperatures (T<200 K). We obtain ΔT vs H curves, and analyze how the effect varies by changing the rate of the magnetic field ramp. Our results show that the intensity of the effect increases with the magnetic field change rate. We also have obtained the effective heat capacity of the system without the sample by performing calorimetric measurements using a pulse heat method, fitting the temperature change with a two tau description. With this analysis, we are able to describe the influence of the environment and subtract it to calculate the adiabatic temperature change of the sample. © 2012 Elsevier B.V.
author Sacanell, Joaquín Gonzalo
Quintero, Mariano Horacio
author_facet Sacanell, Joaquín Gonzalo
Quintero, Mariano Horacio
author_sort Sacanell, Joaquín Gonzalo
title Direct observation of magnetocaloric effect by differential thermal analysis: Influence of experimental parameters
title_short Direct observation of magnetocaloric effect by differential thermal analysis: Influence of experimental parameters
title_full Direct observation of magnetocaloric effect by differential thermal analysis: Influence of experimental parameters
title_fullStr Direct observation of magnetocaloric effect by differential thermal analysis: Influence of experimental parameters
title_full_unstemmed Direct observation of magnetocaloric effect by differential thermal analysis: Influence of experimental parameters
title_sort direct observation of magnetocaloric effect by differential thermal analysis: influence of experimental parameters
publishDate 2012
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09214526_v407_n16_p3305_RotsteinHabarnau
http://hdl.handle.net/20.500.12110/paper_09214526_v407_n16_p3305_RotsteinHabarnau
work_keys_str_mv AT sacanelljoaquingonzalo directobservationofmagnetocaloriceffectbydifferentialthermalanalysisinfluenceofexperimentalparameters
AT quinteromarianohoracio directobservationofmagnetocaloriceffectbydifferentialthermalanalysisinfluenceofexperimentalparameters
_version_ 1768543711455608832

Ejemplares similares