التفاصيل البيبلوغرافية
| العنوان: |
Direct observation of magnetocaloric effect by differential thermal analysis: Influence of experimental parameters |
| المؤلفون: |
Sacanell, Joaquín Gonzalo, Quintero, Mariano Horacio |
| سنة النشر: |
2012 |
| المجموعة: |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
| مصطلحات موضوعية: |
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 |
| الوصف: |
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. |
| نوع الوثيقة: |
other/unknown material |
| اللغة: |
unknown |
| Relation: |
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 |
| الاتاحة: |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09214526_v407_n16_p3305_RotsteinHabarnau
https://hdl.handle.net/20.500.12110/paper_09214526_v407_n16_p3305_RotsteinHabarnau |
| رقم الانضمام: |
edsbas.3AF5AD5C |
| قاعدة البيانات: |
BASE |