Simple Set-Up for Adiabatic Measurements of Magnetocaloric Effect

P. Álvarez-Alonso; J. López-García; G. Daniel-Perez; D. Salazar; P. Lázpita; J.P. Camarillo; H. Flores-Zuñiga; D. Rios-Jara; J.L. Sánchez-Llamazares; V.A. Chernenko

doi:10.4028/www.scientific.net/KEM.644.215

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 644Simple Set-Up for Adiabatic Measurements of...

Simple Set-Up for Adiabatic Measurements of Magnetocaloric Effect

Abstract:

We present a cost-effective and robust set-up designed to measure directly the magnetic field-induced adiabatic temperature change. The system uses a piston to introduce/remove the sample to/from the magnetic field (μ₀∆H is up to 1.7T) created by an ordinary electromagnet. The temperature of the sample is controlled by a double pipe heat exchanger operating by the electrical heater and air flow circulation from a Dewar with liquid nitrogen to the sample holder assembly.We have measured the adiabatic temperature change, ΔT_ad, of two polycrystalline samples: Gd and Ni₅₀Mn₃₅In₁₅ Heusler alloy. At the second-order magnetic phase transitions (18oC for Gd and 42oC for Ni₅₀Mn₃₅In₁₅), ΔT_ad under μ₀∆H=1.7T are 3.8±0.1oC for Gd and 1.9±0.1oC for Ni₅₀Mn₃₅In₁₅. The Heusler alloy shows an inverse magnetocaloric effect: ΔT_ad is-1.5±0.1oC on cooling and-1.6±0.1oC on heating at the martensitic transformation temperatures of ~24oC and ~29oC, respectively.

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Periodical:

Key Engineering Materials (Volume 644)

Pages:

215-218

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.644.215

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Online since:

May 2015

Authors:

P. Álvarez-Alonso*, J. López-García, G. Daniel-Perez, D. Salazar, P. Lázpita, J.P. Camarillo, H. Flores-Zuñiga, D. Rios-Jara, J.L. Sánchez-Llamazares, V.A. Chernenko

Keywords:

Adiabatic Temperature Change, Magnetocaloric Effect, Martensitic Transformation

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